Orders of magnitude (length)

Short description: Range of lengths from the subatomic to the astronomical scales

Graphical overview of sizes

The following are examples of orders of magnitude for different lengths.

## Contents

* 1 Overview
* 2 Detailed list
* 2.1 Subatomic scale
* 2.2 Atomic to cellular scale
* 2.3 Cellular to human scale
* 2.4 Human to astronomical scale
* 2.5 Astronomical scale
* 3 1 quectometre and less
* 4 1 rontometre
* 5 10 rontometres
* 6 1 yoctometre
* 7 1 zeptometre
* 8 10 zeptometres
* 9 100 zeptometres
* 10 1 attometre
* 11 10 attometres
* 12 100 attometres
* 13 1 femtometre (or 1 fermi)
* 14 10 femtometres
* 15 100 femtometres
* 16 1 picometre
* 17 10 picometres
* 18 100 picometres
* 19 1 nanometre
* 20 10 nanometres
* 21 100 nanometres
* 22 1 micrometre (or 1 micron)
* 23 10 micrometres
* 24 100 micrometres
* 25 1 millimetre
* 26 1 centimetre
* 27 1 decimetre
* 27.1 Conversions
* 27.2 Wavelengths
* 27.3 Human-defined scales and structures
* 27.4 Nature
* 27.5 Astronomical
* 28 1 metre
* 28.1 Conversions
* 28.2 Human-defined scales and structures
* 28.3 Sports
* 28.4 Nature
* 28.5 Astronomical
* 29 1 decametre
* 29.1 Conversions
* 29.2 Human-defined scales and structures
* 29.3 Sports
* 29.4 Nature
* 29.5 Astronomical
* 30 1 hectometre
* 30.1 Conversions
* 30.2 Human-defined scales and structures
* 30.3 Sports
* 30.4 Nature
* 30.5 Astronomical
* 31 1 kilometre
* 31.1 Conversions
* 31.2 Human-defined scales and structures
* 31.3 Geographical
* 31.4 Astronomical
* 32 10 kilometres
* 32.1 Conversions
* 32.2 Sports
* 32.3 Human-defined scales and structures
* 32.4 Geographical
* 32.5 Astronomical
* 33 100 kilometres
* 33.1 Conversions
* 33.2 Human-defined scales and structures
* 33.3 Geographical
* 33.4 Astronomical
* 34 1 megametre
* 34.1 Conversions
* 34.2 Human-defined scales and structures
* 34.3 Sports
* 34.4 Geographical
* 34.5 Astronomical
* 35 10 megametres
* 35.1 Conversions
* 35.2 Human-defined scales and structures
* 35.3 Geographical
* 35.4 Astronomical
* 36 100 megametres
* 37 1 gigametre
* 38 10 gigametres
* 39 100 gigametres
* 40 1 terametre
* 41 10 terametres
* 42 100 terametres
* 43 1 petametre
* 44 10 petametres
* 45 100 petametres
* 46 1 exametre
* 47 10 exametres
* 48 100 exametres
* 49 1 zettametre
* 50 10 zettametres
* 51 100 zettametres
* 52 1 yottametre
* 53 10 yottametres
* 54 100 yottametres
* 55 1 ronnametre
* 56 See also
* 57 Notes
* 58 References
* 59 External links

## Overview

Scale | Range (m) | Unit | Example items

|
|
|

≥ | <
Subatomic  | –  | 0  | –  | Gravitational singularity
10−36 | 10−33 | ℓP | Fixed value (not a range). Quantum foam, string
10−18 | 10−15 | am | proton, neutron, pion
Atomic to cellular | 10−15 | 10−12 | fm | Atomic nucleus
10−12 | 10−9 | pm | Wavelength of gamma rays and X-rays, hydrogen atom
10−9 | 10−6 | nm | DNA helix, virus, wavelength of optical spectrum, transistors used in CPUs
Cellular to human | 10−6 | 10−3 | μm | Bacterium, fog water droplet, human hair's diameter[note 1]
10−3 | 1 | mm | Mosquito, golf ball, domestic cat, violin, football
Human to astronomical | 1 | 103 | m | Piano, human, automobile, sperm whale, football field, Eiffel Tower
103 | 106 | km | Mount Everest, length of Panama Canal and Trans-Siberian Railway, larger asteroid
Astronomical | 106 | 109 | Mm | The Moon, Earth, one light-second
109 | 1012 | Gm | Sun, one light-minute, Earth's orbit
1012 | 1015 | Tm | Orbits of outer planets, Solar System
1015 | 1018 | Pm | A light-year, the distance to Proxima Centauri
1018 | 1021 | Em | Galactic arm
1021 | 1024 | Zm | Milky Way, distance to Andromeda Galaxy
1024 | 1027 | Ym | Huge-LQG, Hercules–Corona Borealis Great Wall, Observable universe

## Detailed list

To help compare different orders of magnitude, the following list describes various lengths between 1.6×10−35 metres and 101010122metres.

### Subatomic scale

Factor (m)  | Multiple  | Value  | Item

|
|
|

0  | 0  | 0  | Singularity
10−35 | 1 Planck length | 0.0000162 qm
10−24 | 1 yoctometre (ym)  | 142 ym  | Effective cross section radius of 1 MeV neutrinos[1]
10−21 | 1 zeptometre (zm)  |  | Preons, hypothetical particles proposed as subcomponents of quarks and leptons; the upper bound for the width of a cosmic string in string theory
7 zm  | Effective cross section radius of high-energy neutrinos[2]
310 zm  | De Broglie wavelength of protons at the Large Hadron Collider (4 TeV as of 2012[update])
10−18 | 1 attometre (am)  |  | Upper limit for the size of quarks and electrons
Sensitivity of the LIGO detector for gravitational waves[3]
Upper bound of the typical size range for "fundamental strings"[4]
10−17 | 10 am  |  | Range of the weak force
10−16 | 100 am  | 850 am  | Approximate proton radius[5]

### Atomic to cellular scale

Factor (m)  | Multiple  | Value  | Item

|
|
|

10−15 | 1 femtometre (fm, fermi)  | 1 fm  | Approximate limit of the gluon-mediated color force between quarks[6][7]
1.5 fm  | Effective cross section radius of an 11 MeV proton[8]
2.81794 fm  | Classical electron radius[9]
3 fm  | Approximate limit of the meson-mediated nuclear binding force[6][7]
1.75 to 15 fm  | Diameter range of the atomic nucleus[4][10]
10−12 | 1 picometre (pm)  | 0.75 to 0.8225 pm  | Longest wavelength of gamma rays
1 pm  | Distance between atomic nuclei in a white dwarf
2.4 pm  | Compton wavelength of electron
5 pm  | Wavelength of shortest X-rays
10−11 | 10 pm
28 pm  | Radius of helium atom
53 pm  | Bohr radius (radius of a hydrogen atom)
10−10 | 100 pm  | 100 pm  | 1 ångström (also covalent radius of sulfur atom[11])
154 pm  | Length of a typical covalent bond (C–C)
280 pm  | Average size of the water molecule (actual lengths may vary)
500 pm  | Width of protein α helix
10−9 | 1 nanometre (nm)  | 1 nm  | Diameter of a carbon nanotube[12] Diameter of smallest transistor gate (as of 2016)[13]
2 nm  | Diameter of the DNA helix[14]
2.5 nm  | Smallest microprocessor transistor gate oxide thickness (as of January 2007[update])[citation needed]
3.4 nm  | Length of a DNA turn (10 bp)[15]
6–10 nm  | Thickness of cell membrane
10−8 | 10 nm  | 10 nm  | Thickness of cell wall in Gram-negative bacteria[citation needed]
10 nm  | As of 2016[update], the 10 nanometre was the smallest semiconductor device fabrication node[16]
40 nm  | Extreme ultraviolet wavelength
50 nm  | Flying height of the head of a hard disk[17]
10−7 | 100 nm  | 121.6 nm  | Wavelength of the Lyman-alpha line[18]
120 nm  | Typical diameter of the human immunodeficiency virus (HIV)[19]
400–700 nm  | Approximate wavelength range of visible light[20]

### Cellular to human scale

Factor (m)  | Multiple  | Value  | Item

|
|
|

10−6 | 1 micrometre (μm)

(also called 1 micron)

| 1–4 μm  | Typical length of a bacterium[21]
4 μm  | Typical diameter of spider silk[22]
7 μm  | Typical size of a red blood cell[23]
10−5 | 10 μm  | 10 μm  | Typical size of a fog, mist, or cloud water droplet
10 μm  | Width of transistors in the Intel 4004, the world's first commercial microprocessor
12 μm  | Width of acrylic fiber
17-181 μm  | Width range of human hair[24]
10−4 | 100 μm  | 340 μm  | Size of a pixel on a 17-inch monitor with a resolution of 1024×768
560 μm  | Thickness of the central area of a human cornea[25]
750 μm  | Maximum diameter of Thiomargarita namibiensis, the largest bacterium ever discovered (as of 2010[update])
10−3 | 1 millimetre (mm)  | ~5 mm  | Length of an average flea is 1–10 mm (usually <5 mm)[26]
2.54 mm  | One-tenth inch; distance between pins in DIP (dual-inline-package) electronic components
5.70 mm  | Diameter of the projectile in 5.56×45mm NATO ammunition
10−2 | 1 centimetre (cm)  | 20 mm  | Approximate width of an adult human finger
54 mm × 86 mm  | Dimensions of a credit card, according to the ISO/IEC 7810 ID-1 standard
73–75 mm  | Diameter of a baseball, according to Major League Baseball guidelines[27]
10−1 | 1 decimetre (dm)  | 120 mm  | Diameter of a compact disc
660 mm  | Length of the longest pine cones, produced by the sugar pine[28]
900 mm  | Average length of a rapier, a fencing sword[29]

### Human to astronomical scale

Factor (m)  | Multiple  | Value  | Item

|
|
|

1 (100) | 1 metre (m)  | 1 m (exactly)  | Since 2019, defined as the length of the path travelled by light in a vacuum during a time interval of 1/299,792,458 of a second, where the second is defined by a hyperfine transition frequency of caesium.
2.72 m  | Height of Robert Wadlow, tallest-known human.[30]
8.38 m  | Length of a London bus (AEC Routemaster)
101 | 1 decametre (dam)  | 33 m  | Length of the longest-known blue whale[31]
52 m  | Height of the Niagara Falls[32]
93.47 m  | Height of the Statue of Liberty
102 | 1 hectometre (hm)  | 105 m  | Length of a typical football field
137 m (147 m)  | Height (present and original) of the Great Pyramid of Giza
300 m  | Height of the Eiffel Tower, one of the famous monuments of Paris
979 m  | Height of the Salto Angel, the world's highest free-falling waterfall (Venezuela)
103 | 1 kilometre (km)  | 2.3 km  | Length of the Three Gorges Dam, the largest dam in the world[33][34]
3.1 km  | Narrowest width of the Strait of Messina, separating Italy and Sicily
8.848 km  | Height of Mount Everest, the highest mountain on Earth
104 | 10 km  | 10.9 km  | Depth of the Challenger Deep in the Mariana Trench, the deepest-known point on Earth's surface
27 km  | Circumference of the Large Hadron Collider, as of May 2010[update] the largest and highest energy particle accelerator
42.195 km  | Length of a marathon
105 | 100 km  | 100 km  | The distance the IAU considers to be the limit to space, called the Karman line
163 km  | Length of the Suez Canal, connecting the Mediterranean Sea to the Red Sea
491 km  | Length of the Pyrenees, the mountain range separating Spain and France
974.6 km  | Greatest diameter of the dwarf planet Ceres.[35]
106 | 1 megametre (Mm)  | 2.38 Mm  | Diameter of dwarf planet Pluto, formerly the smallest planet category[note 2] in the Solar System
3.48 Mm  | Diameter of the Moon
5.2 Mm  | Typical distance covered by the winner of the 24 Hours of Le Mans automobile endurance race
6.371 Mm  | Average radius of Earth
6.378 Mm  | Equatorial radius of Earth
6.4 Mm  | Length of the Great Wall of China
6.6 Mm  | Approximate length of the two longest rivers, the Nile and the Amazon
7.821 Mm  | Length of the Trans-Canada Highway
9.288 Mm  | Length of the Trans-Siberian Railway, longest in the world

### Astronomical scale

Factor (m)  | Multiple  | Value  | Item

|
|
|

107 | 10 Mm  | 12.756 Mm  | Equatorial diameter of Earth
20.004 Mm  | Length of a meridian on Earth (distance between Earth's poles along the surface)[36]
40.075 Mm  | Length of Earth's equator
108 | 100 Mm  | 142.984 Mm  | Diameter of Jupiter
299.792 Mm  | Distance traveled by light in vacuum in one second (a light-second, exactly 299,792,458 m by definition of the speed of light)
384.4 Mm  | Moon's orbital distance from Earth
109 | 1 gigametre (Gm)  | 1.39 Gm  | Diameter of the Sun
5.15 Gm  | Greatest mileage ever recorded by a car (3.2 million miles by a 1966 Volvo P-1800S)[37]
1010 | 10 Gm  | 18 Gm  | Approximately one light-minute
1011 | 100 Gm  | 150 Gm  | 1 astronomical unit (au); mean distance between Earth and Sun
1012 | 1 terametre (Tm)  | 1.3 Tm  | Optical diameter of Betelgeuse
1.4 Tm  | Orbital distance of Saturn from Sun
2 Tm  | Estimated optical diameter of VY Canis Majoris, one of the largest-known stars
5.9 Tm  | Orbital distance of Pluto from the Sun
~ 7.5 Tm  | Outer boundary of the Kuiper belt
1013 | 10 Tm  |  | Diameter of the Solar System as a whole[4]
21.49 Tm  | Distance of the Voyager 1 spacecraft from Sun (as of Oct 2018[update]), the farthest man-made object so far[38]
62.03 Tm  | Estimated radius of the event horizon of the supermassive black hole in NGC 4889, the largest-known black hole to date
1014 | 100 Tm  | 180 Tm  | Size of the debris disk around the star 51 Pegasi[39]
200 Tm | Total length of DNA molecules in all cells of an adult human body[citation needed]
1015 | 1 petametre (Pm)  | ~7.5 Pm  | Supposed outer boundary of the Oort cloud (~ 50,000 au)
9.461 Pm  | Distance traveled by light in vacuum in one year; at its current speed, Voyager 1 would need 17,500 years to travel this distance
1016 | 10 Pm  | 30.857 Pm  | 1 parsec
39.9 Pm  | Distance to nearest star (Proxima Centauri)
41.3 Pm  | As of March 2013, distance to nearest discovered extrasolar planet (Alpha Centauri Bc)
1017 | 100 Pm  | 193 Pm  | As of October 2010, distance to nearest discovered extrasolar planet with potential to support life as presently defined by science (Gliese 581 d)
615 Pm  | Approximate radius of humanity's radio bubble, caused by high-power TV broadcasts leaking through the atmosphere into outer space
1018 | 1 exametre (Em)  | 1.9 Em  | Distance to nearby solar twin (HIP 56948), a star with properties virtually identical to the Sun[40]
1019 | 10 Em  | 9.46 Em
1020 | 100 Em  | 113.5 Em  | Thickness of Milky Way Galaxy's gaseous disk[41]
1021 | 1 zettametre (Zm)
1.54 Zm  | Distance to SN 1987A, the most recent naked eye supernova
1.62 Zm  | Distance to the Large Magellanic Cloud (a dwarf galaxy orbiting the Milky Way)
1.66 Zm  | Distance to the Small Magellanic Cloud (another dwarf galaxy orbiting the Milky Way)
1.9 Zm  | Diameter of galactic disk of Milky Way Galaxy[42][43][44][45]
6.15 Zm  | Diameter of the low surface brightness disc halo of the giant spiral galaxy Malin 1
1022 | 10 Zm  | 13.25 Zm  | Radius of the diffuse stellar halo of IC 1101, one of the largest-known galaxies
24 Zm  | Distance to Andromeda Galaxy
30.857 Zm  | 1 megaparsec
50 Zm  | Diameter of Local Group of galaxies
1023 | 100 Zm  | 300–600 Zm  | Distance to Virgo cluster of galaxies
1024 | 1 yottametre (Ym)  | 2.19 Ym  | Diameter of the Local Supercluster and the largest voids and filaments
2.8 Ym  | End of Greatness
~5 Ym  | Diameter of the Horologium Supercluster[46]
9.461 Ym | Diameter of the Pisces–Cetus Supercluster Complex, the supercluster complex which includes Earth
1025 | 10 Ym  | 13 Ym  | Length of the Sloan Great Wall, a giant wall of galaxies (galactic filament)[47]
30.857 Ym  | 1 gigaparsec
37.84 Ym  | Length of the Huge-LQG, a group of 73 quasars
1026 | 100 Ym  | 95 Ym  | Estimated light travel distance to certain quasars. Length of the Hercules–Corona Borealis Great Wall, a colossal wall of galaxies, the largest and the most massive structure in the observable universe as of 2014
127 Ym  | Estimated light travel distance to GN-z11, the most distant object ever observed
870 Ym  | Approximate diameter (comoving distance) of the visible universe[4]
1027 | 1 Rm  | 1.2 Rm  | Lower bound of the (possibly infinite) radius of the universe, if it is a 3-sphere, according to one estimate using the WMAP data at 95% confidence[48] It equivalently implies that there are at minimum 21 particle horizon-sized volumes in the universe.
1010115[note 3] | 1010115 m  | 1010115 m  | According to the laws of probability, the distance one must travel until one encounters a volume of space identical to our observable universe with conditions identical to our own.[49][50]
101010122 | 101010122 m  | 101010122 m  | Minimal size of universe after cosmological inflation, implied by one resolution of the No-Boundary Proposal[51]

## 1 quectometre and less

The quectometre (SI symbol: qm) is a unit of length in the metric system equal to 10−30 metres. To help compare different orders of magnitude, this section lists lengths shorter than 10−30 m (1 qm).

* 1.6 × 10−5 quectometres (1.6 × 10−35 metres) – the Planck length (Measures of distance shorter than this do not make physical sense, according to current theories of physics.)
* 1 qm – 1 quectometre, the smallest named subdivision of the metre in the SI base unit of length, one nonillionth of a metre.[52]

## 1 rontometre

The rontometre (SI symbol: rm) is a unit of length in the metric system equal to 10−27 metres.

* 1 rm – 1 rontometre, a subdivision of the metre in the SI base unit of length, one octillionth of a metre.[52]

## 10 rontometres

* 10 rm – the length of one side of a square whose area is one shed, a unit of target cross section used in nuclear physics

## 1 yoctometre

The yoctometre (SI symbol: ym) is a unit of length in the metric system equal to 10−24 metres.

* 2 ym – the effective cross-section radius of 1 MeV neutrinos as measured by Clyde Cowan and Frederick Reines[citation needed]

## 1 zeptometre

The zeptometre (SI symbol: zm) is a unit of length in the metric system equal to 10−21 metres. To help compare different orders of magnitude, this section lists lengths between 10−21 m and 10−20 m (1 zm and 10 zm).

* 2 zm – the upper bound for the width of a cosmic string in string theory.[citation needed]
* 2 zm – radius of effective cross section for a 20 GeV neutrino scattering off a nucleon[citation needed]
* 7 zm – radius of effective cross section for a 250 GeV neutrino scattering off a nucleon[citation needed]

## 10 zeptometres

To help compare different orders of magnitude, this section lists lengths between 10−20 m and 10−19 m (10 zm and 100 zm).

## 100 zeptometres

To help compare different orders of magnitude, this section lists lengths between 10−19 m and 10−18 m (100 zm and 1 am).

* 177 zm – de Broglie wavelength of protons at the Large Hadron Collider (7 TeV as of 2010)[citation needed]

## 1 attometre

The attometre (SI symbol: am) is a unit of length in the metric system equal to 10−18 metres. To help compare different orders of magnitude, this section lists lengths between 10−18 m and 10−17 m (1 am and 10 am).

* 1 am – sensitivity of the LIGO detector for gravitational waves[citation needed]
* 1 am – upper limit for the size of quarks and electrons[citation needed]

## 10 attometres

To help compare different orders of magnitude, this section lists lengths between 10−17 m and 10−16 m (10 am and 100 am).

* 10 am – range of the weak force[citation needed]

* 86 am – Charge radius of a Bottom eta meson[53]

## 100 attometres

To help compare different orders of magnitude, this section lists lengths between 10−16 m and 10−15 m (100 am and 1 fm).

* 850 am – approximate proton radius[citation needed]

## 1 femtometre (or 1 fermi)

The femtometre (SI symbol: fm) is a unit of length in the metric system equal to 10−15 metres. In particle physics, this unit is sometimes called a fermi, also with abbreviation "fm". To help compare different orders of magnitude, this section lists lengths between 10−15 metres and 10−14 metres (1 femtometre and 10 fm).

* 1 fm – diameter of a neutron, approximate range-limit of the color force carried between quarks by gluons[6][7]
* 1.5 fm – diameter of the scattering cross section of an 11 MeV proton with a target proton[citation needed]
* 1.75 fm – the effective charge diameter of a proton[54]
* 2.81794 fm – classical electron radius
* 3 fm – approximate range-limit of the nuclear binding force mediated by mesons[6][7]
* 7 fm – the radius of the effective scattering cross section for a gold nucleus scattering a 6 MeV alpha particle over 140 degrees[citation needed]

## 10 femtometres

To help compare different orders of magnitude, this section lists lengths between 10−14 m and 10−13 m (10 fm and 100 fm).

* 1.75 to 15 fm – Diameter range of the atomic nucleus[citation needed]
* 10 fm – the length of one side of a square whose area is one barn (10-28 m2), a unit of target cross section used in nuclear physics
* 30.8568 fm – 1 quectoparsec (10−30 parsecs)

## 100 femtometres

To help compare different orders of magnitude, this section lists lengths between 10−13 m and 10−12 m (100 fm and 1 pm).

* 570 fm – typical distance from the atomic nucleus of the two innermost electrons (electrons in the 1s shell) in the uranium atom, the heaviest naturally-occurring atom

## 1 picometre

The picometre (SI symbol: pm) is a unit of length in the metric system equal to 10−12 metres (⁠1/1000000000000⁠ m = 0.000000000001 m). To help compare different orders of magnitude this section lists lengths between 10−12 and 10−11 m (1 pm and 10 pm).

* 1 pm – distance between atomic nuclei in a white dwarf[citation needed]
* 1 pm – reference value of particle displacement in acoustics[55]
* 2.4 pm – The Compton wavelength of an electron
* 5 pm – shorter X-ray wavelengths (approx.)

## 10 picometres

To help compare different orders of magnitude this section lists lengths between 10−11 and 10−10 m (10 pm and 100 pm).

* 25 pm – approximate radius of a helium atom, the smallest neutral atom
* 30.8568 pm – 1 rontoparsec
* 50 pm – radius of a hydrogen atom
* 50 pm – bohr radius: approximate radius of a hydrogen atom
* ~50 pm – best resolution of a high-resolution transmission electron microscope
* 60 pm – radius of a carbon atom
* 93 pm – length of a diatomic carbon molecule
* 96 pm – H–O bond length in a water molecule

## 100 picometres

To help compare different orders of magnitude this section lists lengths between 10−10 and 10−9 m (100 pm and 1 nm; 1 Å and 10 Å).

* 100 pm – 1 ångström
* 100 pm – covalent radius of sulfur atom
* 120 pm – van der Waals radius of a neutral hydrogen atom
* 120 pm – radius of a gold atom
* 126 pm – covalent radius of ruthenium atom
* 135 pm – covalent radius of technetium atom
* 150 pm – Length of a typical covalent bond (C–C)
* 153 pm – covalent radius of silver atom
* 155 pm – covalent radius of zirconium atom
* 175 pm – covalent radius of thulium atom
* 200 pm – highest resolution of a typical electron microscope
* 225 pm – covalent radius of caesium atom
* 280 pm – Average size of the water molecule
* 298 pm – radius of a caesium atom, calculated to be the largest atomic radius
* 340 pm – thickness of single layer graphene
* 356.68 pm – width of diamond unit cell
* 403 pm – width of lithium fluoride unit cell
* 500 pm – Width of protein α helix
* 543 pm – silicon lattice spacing
* 560 pm – width of sodium chloride unit cell
* 700 pm – width of glucose molecule
* 700 pm – diameter of a buckyball[56]
* 780 pm – mean width of quartz unit cell
* 820 pm – mean width of ice unit cell
* 900 pm – mean width of coesite unit cell

## 1 nanometre

The nanometre (SI symbol: nm) is a unit of length in the metric system equal to 10−9 metres (⁠1/1000000000⁠ m = 0.000000001 m). To help compare different orders of magnitude, this section lists lengths between 10−9 and 10−8 m (1 nm and 10 nm).

* 1 nm – diameter of a carbon nanotube
* 1 nm – roughly the length of a sucrose molecule, calculated by Albert Einstein
* 2.3 nm – length of a phospholipid
* 2.3 nm – smallest gate oxide thickness in microprocessors
* 3 nm – width of a DNA helix
* 3 nm – flying height of the head of a hard disk
* 3 nm – as of 2019[update], the average half-pitch of a memory cell manufactured circa 2022
* 3.4 nm – length of a DNA turn (10 bp)
* 3.8 nm – size of an albumin molecule
* 5 nm – size of the gate length of a 16 nm processor
* 5 nm – as of October 2018[update], the average half-pitch of a memory cell manufactured circa 2019–2020
* 6 nm – length of a phospholipid bilayer
* 6–10 nm – thickness of cell membrane
* 6.8 nm – width of a haemoglobin molecule
* 7 nm – diameter of actin filaments
* 7 nm – the average half-pitch of a memory cell manufactured circa 2018
* 10 nm – Thickness of cell wall in Gram-negative bacteria

## 10 nanometres

To help compare different orders of magnitude this section lists lengths between 10−8 and 10−7 m (10 nm and 100 nm).

* 10 nm – the average length of a nanowire
* 10 nm – lower size of tobacco smoke[57]
* 10 nm – the average half-pitch of a memory cell manufactured circa 2016 –2017
* 13 nm – the length of the wavelength that is used for EUV lithography
* 14 nm – Length of a porcine circovirus
* 14 nm – the average half-pitch of a memory cell manufactured circa 2013
* 15 nm – Length of an antibody
* 18 nm – diameter of tobacco mosaic virus[58] (Generally, viruses range in size from 20 nm to 450 nm.)[citation needed]
* 20 nm – Length of a nanobe, could be one of the smallest forms of life
* 20–80 nm – thickness of cell wall in Gram-positive bacteria[59]
* 20 nm – thickness of bacterial flagellum
* 22 nm – the average half-pitch of a memory cell manufactured circa 2011–2012
* 22 nm – Smallest feature size of production microprocessors in September 2009[60]
* 25 nm – diameter of a microtubule
* 30 nm – lower size of cooking oil smoke
* 30.8568 nm – 1 yoctoparsec
* 32 nm – the average half-pitch of a memory cell manufactured circa 2009–2010
* 40 nm – extreme ultraviolet wavelength
* 45 nm – the average half-pitch of a memory cell manufactured circa 2007–2008
* 50 nm – upper size for airborne virus particles
* 50 nm – flying height of the head of a hard disk[61]
* 65 nm – the average half-pitch of a memory cell manufactured circa 2005–2006
* 58 nm – height of a T7 bacteriophage
* 90 nm – Human immunodeficiency virus (HIV) (generally, viruses range in size from 20 nm to 450 nm)
* 90 nm – the average half-pitch of a memory cell manufactured circa 2002–2003
* 100 nm – Length of a mesoporous silica nanoparticle

## 100 nanometres

Comparison of sizes of semiconductor manufacturing process nodes with some microscopic objects and visible light wavelengths. At this scale, the width of a human hair is about 10 times that of the image.[62]

To help compare different orders of magnitude, this section lists lengths between 10−7 and 10−6 m (100 nm and 1 μm).

* 100 nm – greatest particle size that can fit through a surgical mask[63]
* 100 nm – 90% of particles in wood smoke are smaller than this.[citation needed]
* 120 nm – greatest particle size that can fit through a ULPA filter[citation needed]
* 120 nm – diameter of a human immunodeficiency virus (HIV)[64]
* 120 nm – approximate diameter of SARS-CoV-2[65]
* 125 nm – standard depth of pits on compact discs (width: 500 nm, length: 850 nm to 3.5 μm)
* 180 nm – typical length of the rabies virus
* 200 nm – typical size of a Mycoplasma bacterium, among the smallest bacteria
* 300–400 nm – near ultraviolet wavelength
* 300 nm – greatest particle size that can fit through a HEPA (high efficiency particulate air) filter (N100 removes up to 99.97% at 0.3 micrometres, N95 removes up to 95% at 0.3 micrometres)[citation needed]
* 400–420 nm – wavelength of violet light (see Color and Visible spectrum)
* 420–440 nm – wavelength of indigo light
* 440–500 nm – wavelength of blue light
* 500–520 nm – wavelength of cyan light
* 520–565 nm – wavelength of green light
* 565–590 nm – wavelength of yellow light
* 590–625 nm – wavelength of orange light
* 625–700 nm – wavelength of red light
* 700–1.4 μm – wavelength of near-infrared radiation

## 1 micrometre (or 1 micron)

The silk for a spider's web is 5–7 μm (0.00020–0.00028 in) wide

The micrometre (SI symbol: μm) is a unit of length in the metric system equal to 10−6 metres (⁠1/1000000⁠ m = 0.000001 m). To help compare different orders of magnitude, this section lists some items with lengths between 10−6 and 10−5 m (between 1 and 10 micrometres, or μm).

* ~0.7–300 μm – wavelength of infrared radiation
* 1 μm – the side of a square of area 10−12 m2
* 1 μm – edge of cube of volume 10−18 m3 (1 fL)
* 1–10 μm – diameter of a typical bacterium[citation needed]
* 1 μm – length of a lysosome
* 1–2 μm – anthrax spore[66]
* 2 μm – length of an average E. coli bacteria
* 3–4 μm – size of a typical yeast cell[67]
* 5 μm – length of a typical human spermatozoon's head[68]
* 6 μm – thickness of the tape in a 120-minute (C120) compact cassette[69]
* 7 μm – diameter of the nucleus of a typical eukaryotic cell[citation needed]
* about 7 μm – diameter of human red blood cells[70]
* 3–8 μm – width of strand of spider web silk[71]
* 5–10 μm – width of a chloroplast[72]
* 8–11 μm – size of a ground-level fog or mist droplet[73][note 4]
* 7–12 μm – the diameter of human white blood cells
* 8–10 μm – the diameter of human macrophages

## 10 micrometres

Fog particles are around 10–50 μm (0.00039–0.00197 in) long.

To help compare different orders of magnitude, this section lists lengths between 10−5 m and 10−4 m (10 μm and 100 μm).

* 10 μm – width of cotton fibre[74]
* 10 μm – tolerance of a Lego brick[75]
* 10 μm – transistor width of the Intel 4004, the world's first commercial microprocessor
* 10 μm – mean longest dimension of a human red blood cell[citation needed]
* 5–20 μm – dust mite excreta[76]
* 10.6 μm – wavelength of light emitted by a carbon dioxide laser
* 15 μm – width of silk fibre[citation needed]
* 17 μm – minimum width of a strand of human hair[24]
* 17.6 μm – one twip, a unit of length in typography
* 10 to 55 μm – width of wool fibre[74]
* 25.4 μm – 1/1,000 inch, commonly referred to as 1 mil in the U.S. and 1 thou in the UK
* 30 μm – length of a human skin cell
* 30.8568 μm – 1 zeptoparsec
* 50 μm – typical length of Euglena gracilis, a flagellate protist[citation needed]
* 50 μm – typical length of a human liver cell, an average-sized body cell[citation needed]
* 50 μm – length of a silt particle
* 60 μm – length of a sperm cell
* 70 to 180 μm – thickness of paper

## 100 micrometres

A paramecium is around 300 μm (0.012 in) long.

To help compare different orders of magnitude, this section lists lengths between 10−4 m and 10−3 m (100 μm and 1 mm). The term myriometre (abbr. mom, equivalent to 100 micrometres; frequently confused with the myriametre, 10 kilometres)[77] is deprecated; the decimal metric prefix myrio-[78] is obsolete[79][80][81] and was not included among the prefixes when the International System of Units was introduced in 1960.

* 100 μm – 1/10 of a millimetre
* 100 μm – 0.00394 inches
* 100 μm – smallest distance that can be seen with the naked eye
* 100 μm – average diameter of a strand of human hair[24]
* 100 μm – thickness of a coat of paint
* 100 μm – length of a dust particle
* 120 μm – the geometric mean of the Planck length and the diameter of the observable universe: √8.8 × 1026 m × 1.6 × 10−35 m
* 120 μm – diameter of a human ovum
* 170 μm – length of the largest sperm cell in nature, belonging to the Drosophila bifurca fruit fly[82][83]
* 181 μm – maximum width of a strand of human hair[24]
* 100–400 μm – length of Demodex mites living in human hair follicles
* 175–200 μm – typical thickness of a solar cell.
* 200 μm – typical length of Paramecium caudatum, a ciliate protist
* 200 μm – nominal width of the smallest commonly available mechanical pencil lead (0.2 mm)
* 250–300 μm – length of a dust mite[84]
* 340 μm – length of a pixel on a 17-inch monitor with a resolution of 1024×768
* 500 μm – typical length of Amoeba proteus, an amoeboid protist
* 500 μm – average length of a grain of sand
* 500 μm – average length of a grain of salt
* 500 μm – average length of a grain of sugar
* 560 μm – thickness of the central area of a human cornea[25]
* 750 μm – diameter of a Thiomargarita namibiensis, the largest bacteria known[85]
* 760 μm – thickness of an identification card

## 1 millimetre

An average red ant is about 5 mm (0.20 in) long.

The millimetre (SI symbol: mm) is a unit of length in the metric system equal to 10−3 metres (⁠1/1000⁠ m = 0.001 m). To help compare different orders of magnitude, this section lists lengths between 10−3 m and 10−2 m (1 mm and 1 cm).

* 1.0 mm – 1/1,000 of a metre
* 1.0 mm – 0.03937 inches or 5/127 (exactly)
* 1.0 mm – side of a square of area 1 mm²
* 1.0 mm – diameter of a pinhead
* 1.5 mm – average length of a flea[26]
* 2.54 mm – distance between pins on old dual in-line package (DIP) electronic components
* 5 mm – length of an average red ant
* 5 mm – diameter of an average grain of rice
* 5.56×45mm NATO – standard ammunition size
* 6 mm – approximate width of a pencil
* 7 mm – length of a Paedophryne amauensis, the smallest-known vertebrate[86]
* 7.1 mm – length of a sunflower seed
* 7.62×51mm NATO – common military ammunition size[87]
* 8 mm – width of old-format home movie film
* 8 mm – length of a Paedocypris progenetica, the smallest-known fish[88]

## 1 centimetre

An average human fingernail is 1 cm (0.39 in) wide

The centimetre (SI symbol: cm) is a unit of length in the metric system equal to 10−2 metres (⁠1/100⁠ m = 0.01 m). To help compare different orders of magnitude, this section lists lengths between 10−2 m and 10−1 m (1 cm and 1 dm).

* 1 cm – 10 millimetres
* 1 cm – 0.39 inches
* 1 cm – edge of a square of area 1 cm2
* 1 cm – edge of a cube of volume 1 mL
* 1 cm – length of a coffee bean
* 1 cm – approximate width of average fingernail
* 1.2 cm – length of a bee
* 1.2 cm – diameter of a die
* 1.5 cm – length of a very large mosquito
* 1.6 cm – length of a Jaragua Sphaero, a very small reptile
* 1.7 cm – length of a Thorius arboreus, the smallest salamander[89]
* 2 cm – approximate width of an adult human finger
* 2.54 cm – 1 inch
* 3.08568 cm – 1 attoparsec
* 3.4 cm – length of a quail egg[90]
* 3.5 cm – width of film commonly used in motion pictures and still photography
* 3.78 cm – amount of distance the Moon moves away from Earth each year[91]
* 4.3 cm – minimum diameter of a golf ball[92]
* 5 cm – usual diameter of a chicken egg
* 5 cm – height of a hummingbird, the smallest-known bird
* 5.08 cm – 2 inches,
* 5.5 × 5.5 × 5.5 cm – dimensions of a 3x3x3 Rubik's cube
* 6.1 cm – average height of an apple
* 7.3–7.5 cm – diameter of a baseball[27]
* 8.6 cm × 5.4 cm – dimensions of a standard credit card[citation needed]
* 9 cm – length of a speckled padloper, the smallest-known turtle

## 1 decimetre

An adult human foot is about 28 cm (11 in) long.

The decimetre (SI symbol: dm) is a unit of length in the metric system equal to 10−1 metres (⁠1/10⁠ m = 0.1 m). To help compare different orders of magnitude, this section lists lengths between 10 centimetres and 100 centimetres (10−1 metre and 1 metre).

### Conversions

10 centimetres (abbreviated to 10 cm) is equal to:

* 1 decimetre (dm), a term not in common use (1 L = 1 dm3.)
* 100 millimetres
* 3.9 inches
* a side of a square of area 0.01 m2
* the edge of a cube with a volume of 1×10−3 m3 (1 L)

### Wavelengths

* 10 cm = 1.0 dm – wavelength of the highest UHF radio frequency, 3 GHz
* 12 cm = 1.2 dm – wavelength of the 2.45 GHz ISM radio band
* 21 cm = 2.1 dm – wavelength of the 1.4 GHz hydrogen emission line, a hyperfine transition of the hydrogen atom
* 100 cm = 10 dm – wavelength of the lowest UHF radio frequency, 300 MHz

### Human-defined scales and structures

* 10.16 cm = 1.016 dm – 1 hand used in measuring height of horses (4 inches)
* 12 cm = 1.2 dm – diameter of a compact disc (CD) (= 120 mm)
* 15 cm = 1.5 dm – length of a Bic pen with cap on
* 22 cm = 2.2 dm – diameter of a typical association football (soccer ball)
* 30 cm = 3 dm – typical school-use ruler length (= 300 mm)
* 30.48 cm = 3.048 dm – 1 foot (measure)
* 60 cm = 6 dm – standard depth (front to back) of a domestic kitchen worktop in Europe (= 600 mm)
* 90 cm = 9 dm – average length of a rapier, a fencing sword[29]
* 91.44 cm = 9.144 dm – one yard (measure)

### Nature

* 10 cm = 1 dm – diameter of the human cervix upon entering the second stage of labour
* 11 cm = 1.1 dm – diameter of an average potato in the US
* 13 cm = 1.3 dm – body length of a Goliath birdeater
* 15 cm = 1.5 dm – approximate size of largest beetle species
* 19 cm = 1.9 dm – length of a banana
* 26.3 cm = 2.6 dm – length of average male human foot
* 29.98 cm = 2.998 dm – distance light in vacuum travels in one nanosecond
* 30 cm = 3.0 dm – maximum leg length of a Goliath birdeater
* 31 cm = 3.1 dm – wingspan of largest butterfly species Ornithoptera alexandrae
* 46 cm = 4.6 dm – length of an average domestic cat
* 50 to 65 cm = 5–6.5 dm – a coati's tail
* 66 cm = 6.6 dm – length of the longest pine cones (produced by the sugar pine[93])

### Astronomical

* 84 cm = 8.4 dm – approximate diameter of 2008 TS26, a meteoroid

## 1 metre

Leonardo da Vinci drew the Vitruvian Man within a square of side 1.83 m (6 ft 0 in) and a circle about 1.2 m (3 ft 11 in) in radius

To help compare different orders of magnitude, this section lists lengths between one metre and ten metres. Light, in vacuum, travels 1 metre in ​1⁄299,792,458, or 3.3356409519815E-9 of a second.

### Conversions

1 metre is:

* 10 decimetres
* 100 centimetres
* 1,000 millimetres
* 39.37 inches
* 3.28 feet
* 1.1 yards
* side of square with area 1 m2
* edge of cube with surface area 6 m2 and volume 1 m3
* radius of circle with area π m2
* radius of sphere with surface area 4π m2 and volume 4/3π m3

### Human-defined scales and structures

* 1 m – approximate height of the top part of a doorknob on a door
* 1 m – diameter of a very large beach ball
* 1.435 m – standard gauge of railway track used by about 60% of railways in the world = 4 ft 8​1⁄2 in
* 2.5 m – distance from the floor to the ceiling in an average residential house[94]
* 2.7 m – length of the Starr Bumble Bee II, the smallest plane
* 2.77–3.44 m – wavelength of the broadcast radio FM band 87–108 MHz
* 3.05 m – the length of an old Mini
* 8.38 m – the length of a London Bus (AEC Routemaster)

### Sports

* 2.44 m – height of an association football goal[95]
* 2.45 m – highest high jump by a human (Javier Sotomayor)[96]
* 3.05 m – (10 feet) height of the basket in basketball
* 8.95 m – longest long jump by a human (Mike Powell)[97]

### Nature

* 1 m – height of Homo floresiensis (the "Hobbit")
* 1.15 m – a pizote (mammal)
* 1.63 m – (5 feet 4 inches) (or 64 inches) – height of average U.S. female human as of 2002[update] (source: U.S. Centers for Disease Control and Prevention (CDC))
* 1.75 m – (5 feet 8 inches) – height of average U.S. male human as of 2002[update] (source: U.S. CDC as per female above)
* 2.5 m – height of a sunflower
* 2.72 m – (8 feet 11 inches) – tallest-known human (Robert Wadlow)[30]
* 3.63 m – the record wingspan for living birds (a wandering albatross)
* 5 m – length of an elephant
* 5.2 m – height of a giraffe[98]
* 5.5 m – height of a Baluchitherium, the largest land mammal ever lived
* 6.5 m – wingspan of Argentavis, the largest flying bird known
* 7.4 m – wingspan of Pelagornis, the bird with longest wingspan ever.[99]
* 7.5 m – approximate length of the human gastrointestinal tract

### Astronomical

* 3–6 m – approximate diameter of 2003 SQ222, a meteoroid
* 4.1 m – diameter of 2008 TC3, a small asteroid that flew into the Earth's atmosphere on 7 October 2008[100]

## 1 decametre

A blue whale has been measured as 33 m (108 ft) long; this drawing compares its length to that of a human diver and a dolphin.

The decametre (SI symbol: dam) is a unit of length in the metric system equal to 10 metres (101 m). To help compare different orders of magnitude, this section lists lengths between 10 and 100 metres.

### Conversions

10 metres (very rarely termed a decametre which is abbreviated as dam) is equal to:

* 10 metres
* 100 decimetres
* 1,000 centimetres
* 10,000 millimetres
* 10,000,000 micrometres (or rarely 10,000,000 microns)
* 32.8 feet
* 11 yards
* side of a square with area 100 m²

### Human-defined scales and structures

* 10 metres – wavelength of the highest shortwave radio frequency, 30 MHz
* 23 metres – height of Luxor Obelisk, located in the Place de la Concorde, Paris, France
* 25 metres – wavelength of the broadcast radio shortwave band at 12 MHz
* 29 metres – height of the lighthouse at Savudrija, Croatia
* 31 metres – wavelength of the broadcast radio shortwave band at 9.7 MHz
* 32 metres - length of one arcsecond of latitude on the surface of the Earth
* 34 metres – height of the Split Point Lighthouse in Aireys Inlet, Victoria, Australia
* 40 metres – average depth beneath the seabed of the Channel tunnel
* 49 metres – wavelength of the broadcast radio shortwave band at 6.1 MHz
* 50 metres – length of a road train
* 55 metres – height of the Leaning Tower of Pisa
* 62.5 metres – height of Pyramid of Djoser
* 64 metres – wingspan of a Boeing 747-400
* 69 metres – wingspan of an Antonov An-124 Ruslan
* 70 metres – length of the Bayeux Tapestry
* 70 metres – width of a typical association football field
* 77 metres – wingspan of a Boeing 747-8
* 88.4 metres – wingspan of an Antonov An-225 Mriya transport aircraft
* 93 metres – height of the Statue of Liberty
* 96 metres – height of Big Ben
* 100 metres – wavelength of the lowest shortwave radio frequency, 3 MHz

### Sports

* 11 metres – approximate width of a doubles tennis court
* 15 metres – width of a standard FIBA basketball court
* 15.24 metres – width of an NBA]basketball court (50 feet)
* 18.44 metres – distance between the front of the pitcher's rubber and the rear point of home plate on a baseball field (60 feet, 6 inches)[101]
* 20 metres – length of cricket pitch (22 yards)[102]
* 27.43 metres – distance between bases on a baseball field (90 feet)
* 28 metres – length of a standard FIBA basketball court
* 28.65 metres – length of an NBA basketball court (94 feet)
* 49 metres – width of an American football field (53​1⁄3 yards)
* 59.436 metres – width of a Canadian football field (65 yards)
* 70 metres – typical width of an association football field
* 91 metres – length of an American football field (100 yards, measured between the goal lines)

### Nature

* 10 metres – average length of human digestive tract[citation needed]
* 12 metres – length of a whale shark, largest living fish
* 12 metres – wingspan of a Quetzalcoatlus, a pterosaur
* 13 metres – length of a giant squid and colossal squid, the largest living invertebrates
* 15 metres – approximate distance the tropical circles of latitude are moving towards the equator and the polar circles are moving towards the poles each year due to a natural, gradual decrease in the Earth's axial tilt
* 18 metres – height of a Sauroposeidon, the tallest-known dinosaur
* 20 metres – length of a Leedsichthys, the largest-known fish to have lived
* 21 metres – height of High Force waterfall in England
* 33 metres – length of a blue whale,[103] the largest animal on earth, living or extinct, in terms of mass
* 39 metres – length of a Supersaurus, the longest-known dinosaur and longest vertebrate[104]
* 52 metres – height of Niagara Falls[32]
* 55 metres – length of a bootlace worm, the longest-known animal[105]
* 66 metres - highest possible sea level rise due to a complete melting of all ice on Earth
* 83 metres – height of a Western hemlock

### Astronomical

* 30 metres – diameter of 1998 KY26, a rapidly spinning meteoroid
* 30.8568 metres – 1 femtoparsec
* 32 metres – approximate diameter of 2008 HJ, a small meteoroid

## 1 hectometre

The Great Pyramid of Giza is 138.8 m (455 ft) high. British driver location sign and location marker post on the M27 in Hampshire. The location marker posts are installed at 100-metre intervals.[106]

The hectometre (SI symbol: hm) is a unit of length in the metric system equal to 100 metres (102 m). To compare different orders of magnitude this section lists lengths between 100 metres and 1,000 metres (1 kilometre).

### Conversions

100 metres (sometimes termed a hectometre) is equal to:

* 328 feet
* one side of a 1 hectare square
* a fifth of a modern li, a Chinese unit of measurement
* the approximate distance travelled by light in 300 nanoseconds

### Human-defined scales and structures

* 100 metres – wavelength of the highest medium wave radio frequency, 3 MHz
* 100 metres – spacing of location marker posts on British motorways
* 138.8 metres – height of the Great Pyramid of Giza (Pyramid of Cheops)
* 139 metres – height of the world's tallest roller coaster, Kingda Ka[107]
* 169 metres - height of the Washington Monument
* 187 metres – shortest wavelength of the broadcast radio AM band, 1600 kHz
* 192 metres - height of the Gateway Arch
* 202 metres – length of the Széchenyi Chain Bridge connecting Buda and Pest
* 270 metres - length of the Titanic
* 318 metres – height of The New York Times Building
* 318.9 metres – height of the Chrysler Building
* 328 metres – height of Auckland's Sky Tower, the tallest free-standing structure in the Southern Hemisphere[when?]
* 330 metres – height of the Eiffel Tower (including antenna)[108]
* 341 metres – height of the world's tallest bridge, the Millau Viaduct[when?]
* 390 metres – height of the Empire State Building
* 400–800 metres – heights of the world's tallest skyscrapers of the past 80 years[when?]
* 458 metres – length of the Knock Nevis, the world's largest supertanker
* 553.33 metres – height of the CN Tower[109]
* 555 metres – longest wavelength of the broadcast radio AM band, 540 kHz
* 630 metres – height of the KVLY-TV mast, second-tallest structure in the world
* 646 metres – height of the Warsaw radio mast, the world's tallest structure until its collapse in 1991
* 828 metres – height of Burj Khalifa, world's tallest structure on 17 January 2009[110]
* 1,000 metres – wavelength of the lowest mediumwave radio frequency, 300 kHz

### Sports

* 100 metres – the distance a very fast human can run in about 10 seconds
* 100.584 metres – length of a Canadian football field between the goal lines (110 yards)
* 91.5 metres – 137 metres – length of a soccer field[95]
* 105 metres – length of football pitch (UEFA stadium categories 3 and 4)
* 105 metres – length of a typical football field
* 109.73 metres – total length of an American football field (120 yards, including the end zones)
* 110–150 metres – the width of an Australian football field
* 135–185 metres – the length of an Australian football field
* 137.16 metres – total length of a Canadian football field, including the end zones (150 yards)

### Nature

* 115.5 metres – height of the world's tallest tree in 2007, the Hyperion sequoia[111]
* 310 metres – maximum depth of Lake Geneva
* 340 metres – distance sound travels in air at sea level in one second; see Speed of sound
* 979 metres – height of the Salto Angel, the world's highest free-falling waterfall (Venezuela)
* 1500 metres – distance sound travels in water in one second

### Astronomical

* 270 metres – length of 99942 Apophis
* 535 metres – length of 25143 Itokawa,[112] a small asteroid visited by a spacecraft

## 1 kilometre

Mount Fuji is 3.776 kilometres (2.346 mi) high.

The kilometre (SI symbol: km) is a unit of length in the metric system equal to 1000 metres (103 m). To help compare different orders of magnitude, this section lists lengths between 1 kilometre and 10 kilometres (103 and 104 metres).

### Conversions

1 kilometre (unit symbol km) is equal to:

* 1,000 metres
* 0.621371 miles
* 1,093.61 yards
* 3,280.84 feet
* 39,370.1 inches
* 100,000 centimetres
* 1,000,000 millimetres
* Side of a square of area 1 km2
* Radius of a circle of area π km2

### Human-defined scales and structures

* 1 km – wavelength of the highest long wave radio frequency, 300 kHz[113]
* 1.280 km – span of the Golden Gate Bridge (distance between towers)[114]
* 1.609 km – 1 statute mile
* 1.852 km – 1 nautical mile, equal to 1 arcminute of latitude at the surface of the Earth[115]
* 1.991 km – span of the Akashi Kaikyō Bridge[116]
* 2.309 km – axial length of the Three Gorges Dam, the largest dam in the world[33]
* 3.991 km – length of the Akashi Kaikyō Bridge, longest suspension bridge in the world as of December 2008[update][117]
* 5.072 km – height of Tanggula Mountain Pass, below highest peak in the Tanggula Mountains, highest railway pass in the world as of August 2005[update][118]
* 5.727 km – height of Cerro Aucanquilcha, highest road in the world, located in Chile [119][failed verification]
* 98 airports have paved runways from 4 km to 5.5 km in length.
* 8 km – length of Palm Jebel Ali, an artificial island built off the coast of Dubai
* 9.8 km – length of The World, an artificial archipelago that is also built off the coast of Dubai, whose islands resemble a world map

### Geographical

* 1.637 km – deepest dive of Lake Baikal in Russia , the world's largest freshwater lake[120]
* 2.228 km – height of Mount Kosciuszko, highest point on mainland Australia[121]
* Most of Manhattan is from 3 to 4 km wide.
* 4.810 km – height of Mont Blanc, highest peak in the Alps
* 4.884 km – height of Carstensz Pyramid, highest peak in Oceania[122]
* 4.892 km – height of Mount Vinson, highest peak in Antarctica
* 5.610 km – height of Mount Damavand, highest peak in Iran
* 5.642 km – height of Mount Elbrus, highest peak in Europe
* 5.895 km – height of Mount Kilimanjaro, highest peak in Africa
* 6.081 km – height of Mount Logan, highest peak in Canada
* 6.190 km – height of Denali, highest peak in North America
* 6.959 km – height of Aconcagua, highest peak in South America
* 7.5 km – depth of Cayman Trench, deepest point in the Caribbean Sea
* 8.611 km - height of K2, second highest mountain on Earth
* 8.848 km – height of Mount Everest, highest peak on Earth, on the border between Nepal and China

### Astronomical

* 1 km – diameter of 1620 Geographos
* 1 km – very approximate size of the smallest-known moons of Jupiter
* 1.4 km – diameter of Dactyl, the first confirmed asteroid moon
* 4.8 km – diameter of 5535 Annefrank, an inner belt asteroid
* 5 km – diameter of 3753 Cruithne
* 5 km – length of PSR B1257+12
* 8 km – diameter of Themisto, one of Jupiter's moons
* 8 km – diameter of the Vela Pulsar
* 8.6 km – diameter of Callirrhoe, also known as Jupiter XVII
* 9.737 km – length of PSR B1919+21

## 10 kilometres

The Strait of Gibraltar is 13 km (8.1 mi) wide.

To help compare different orders of magnitude, this section lists lengths between 10 and 100 kilometres (104 to 105 metres). The myriametre[123] (sometimes also spelled myriometre; 10,000 metres) is a deprecated unit name; the decimal metric prefix myria-[78] (sometimes also written as myrio-[124][125][126]) is obsolete[79][80][81] and was not included among the prefixes when the International System of Units was introduced in 1960.

### Conversions

10 kilometres is equal to:

Distance marker on the Rhine: 36 (XXXVI) myriametres from Basel. The stated distance is 360 km (220 mi); the comma is the decimal separator in Germany .

* 10,000 metres
* About 6.2 miles
* 1 mil (the Scandinavian mile), now standardized as 10 km:
* 1 mil, the unit of measure commonly used in Norway and Sweden[127] used to be 11,295 m in Norway and 10,688 m in Sweden.
* farsang, unit of measure commonly used in Iran and Turkey[128]

### Sports

* 42.195 km – length of the marathon[129]

### Human-defined scales and structures

* 18 km – cruising altitude of Concorde
* 27 km – circumference of the Large Hadron Collider, as of May 2010[update] the largest and highest energy particle accelerator
* 34.668 km – highest manned balloon flight (Malcolm D. Ross and Victor E. Prather on 4 May 1961)[130]
* 38.422 km – length of the Second Lake Pontchartrain Causeway in Louisiana, US
* 39 km – undersea portion of the Channel tunnel
* 53.9 km – length of the Seikan Tunnel, as of October 2009[update], the longest rail tunnel in the world[131]
* 77 km – rough total length of the Panama Canal[132]

### Geographical

* 10 km – height of Mauna Kea in Hawaii, measured from its base on the ocean floor
* 11 km – deepest-known point of the ocean, Challenger Deep in the Mariana Trench
* 11 km – average height of the troposphere
* 14 km – width of the Gibraltar strait
* 21 km – length of Manhattan
* 23 km – depth of the largest earthquake ever recorded in the United Kingdom, in 1931 at the Dogger Bank of the North Sea
* 34 km – narrowest width of the English Channel at the Strait of Dover
* 50 km – approximate height of the stratosphere
* 90 km – width of the Bering Strait

### Astronomical

* 10 km – diameter of the most massive neutron stars (3–5 solar masses)
* 13 km – mean diameter of Deimos, the smaller moon of Mars
* 20 km – diameter of the least massive neutron stars (1.44 solar masses)
* 20 km – diameter of Leda, one of Jupiter's moons
* 20 km – diameter of Pan, one of Saturn's moons
* 22 km – diameter of Phobos, the larger moon of Mars
* 27 km – height of Olympus Mons above the Mars reference level,[133][134] the highest-known mountain of the Solar System
* 30.8568 km – 1 picoparsec
* 43 km – diameter difference of Earth's equatorial bulge
* 66 km – diameter of Naiad, the innermost of Neptune's moons

## 100 kilometres

The Suez Canal is 163 km (101 mi) long.

A length of 100 kilometres (about 62 miles), as a rough amount, is relatively common in measurements on Earth and for some astronomical objects. It is the altitude at which the FAI defines spaceflight to begin.

To help compare orders of magnitude, this section lists lengths between 100 and 1,000 kilometres (105 and 106 metres).

### Conversions

A distance of 100 kilometres is equal to about 62 miles (or 62.13711922 miles).

### Human-defined scales and structures

* 100 km – the Karman line: the internationally-recognized boundary of outer space
* 105 km – distance from Giridih to Bokaro
* 109 km – length of High Speed 1 between London and the Channel Tunnel[135]
* 130 km – range of a Scud-A missile
* 163 km – length of the Suez Canal
* 164 km – length of the Danyang–Kunshan Grand Bridge
* 213 km – length of Paris Métro
* 217 km – length of the Grand Union Canal
* 223 km – length of the Madrid Metro
* 300 km – range of a Scud-B missile
* 386 km – altitude of the International Space Station
* 408 km – length of the London Underground (active track)
* 460 km – distance from London to Paris
* 470 km – distance from Dublin to London as the crow flies
* 600 km – range of a Scud-C missile
* 600 km – height above ground of the Hubble Space Telescope
* 804.67 km – (500 miles) distance of the Indy 500 automobile race

### Geographical

* 111 km – distance covered by one degree of latitude on Earth's surface
* 180 km – distance between Mumbai and Nashik
* 203 km – length of Sognefjorden, the third-largest fjord in the world
* 220 km – distance between Pune and Nashik
* 240 km – widest width of the English Channel
* 430 km – length of the Pyrenees
* 500 km – widest width of Sweden from east to west
* 550 km – distance from San Francisco to Los Angeles as the crow flies
* 560 km – distance of Bordeaux–Paris, formerly[when?] the longest one-day professional cycling race[136]
* 590 km – length of land boundary between Finland and Sweden
* 724 km – length of the Om River
* 871 km – distance from Sydney to Melbourne (along the Hume Highway)
* 897 km – length of the River Douro
* 900 km – distance from Berlin to Stockholm
* 956 km – distance from Washington, D.C. to Chicago , Illinois as the crow flies

### Astronomical

* 100 km – the altitude at which the FAI defines spaceflight to begin
* 167 km – diameter of Amalthea, one of Jupiter's inner moons
* 200 km – width of Valles Marineris
* 220 km – diameter of Phoebe, the largest of Saturn's outer moons
* 300 km – the approximate distance travelled by light in one millisecond
* 340 km – diameter of Nereid, the third-largest moon of Neptune
* 350 km – lower bound of Low Earth orbit
* 420 km – diameter of Proteus, the second-largest moon of Neptune
* 468 km – diameter of the asteroid 4 Vesta
* 472 km – diameter of Miranda, one of Uranus's major moons
* 974.6 km – greatest diameter of 1 Ceres,[35] the largest Solar System asteroid[note 2]

## 1 megametre

Small planets, the Moon and dwarf planets in the Solar System have diameters from one to ten million metres. Top row: Mars (left), Mercury (right); bottom row: Moon (left), Pluto (center), and Haumea (right), to scale.

The megametre (SI symbol: Mm) is a unit of length in the metric system equal to 1000000 metres (106 m). To help compare different orders of magnitude, this section lists lengths starting at 106 m (1 Mm or 1,000 km).

### Conversions

1 megametre is equal to:

* 1 E+6 m (one million metres)
* approximately 621.37 miles
* 1 E+12 μm (one trillion micrometres
* Side of square with area 1,000,000 km2

### Human-defined scales and structures

* 2.100 Mm – Length of proposed Iran-Pakistan-India gas pipe
* 2.100 Mm – Distance from Casablanca to Rome
* 2.288 Mm – Length of the official Alaska Highway when it was built in the 1940s[137]
* 3.069 Mm – Length of Interstate 95 (from Houlton, Maine to Miami, Florida)
* 3.846 Mm – Length of U.S. Route 1 (from Fort Kent, Maine to Key West, Florida)
* 5.000 Mm – Width of the United States
* 5.007 Mm – Estimated length of Interstate 90 (Seattle, Washington to Boston, Massachusetts)
* 5.614 Mm – Length of the Australian Dingo Fence[138]
* 6.371 Mm – Global-average Earth radius
* 6.4 Mm – Length of the Great Wall of China
* 7.821 Mm – Length of the Trans-Canada Highway, the world's longest national highway (from Victoria, British Columbia to St. John's, Newfoundland)
* 8.836 Mm – Road distance between Prudhoe Bay, Alaska, and Key West, Florida, the endpoints of the U.S. road network
* 8.852 Mm – Aggregate length of the Great Wall of China, including trenches, hills and rivers[139]
* 9.259 Mm – Length of the Trans-Siberian railway[140]

### Sports

* The Munda Biddi Trail in WA, Australia is over 1,000 km long – the world's longest off-road cycle trail
* 1.200 Mm – the length of the Paris–Brest–Paris bicycling event
* Several endurance auto races are, or were, run for 1,000 km:
* Bathurst 1000
* 1000 km Brands Hatch
* 1000 km Buenos Aires
* 1000 km Donington
* 1000 km Monza
* 1000 km Nürburgring
* 1000 km Silverstone
* 1000 km Spa
* 1000 km Suzuka
* 1000 km Zeltweg

### Geographical

* 1.010 Mm – Distance from San Diego to El Paso as the crow flies
* 2.000 Mm – Distance from Beijing to Hong Kong as the crow flies
* 2.800 Mm – Narrowest width of Atlantic Ocean (Brazil-West Africa)
* 2.850 Mm – Length of the Danube river
* 2.205 Mm – Length of Sweden's total land boundaries
* 2.515 Mm – Length of Norway's total land boundaries
* 3.690 Mm – Length of the Volga river, longest in Europe
* 4.350 Mm – Length of the Yellow River
* 4.800 Mm – Widest width of Atlantic Ocean (U.S.-Northern Africa)
* 5.100 Mm – Distance from Dublin to New York City as the crow flies
* 6.270 Mm – Length of the Mississippi-Missouri River system
* 6.380 Mm – Length of the Yangtze River
* 6.400 Mm – Length of the Amazon River
* 6.758 Mm – Length of the Nile system, longest on Earth
* 8.200 Mm – Approximate Distance from Dublin to San Francisco

### Astronomical

* 1.000 Mm – Estimated shortest axis of triaxial dwarf planet Haumea
* 1.186 Mm – Diameter of Charon, the largest moon of Pluto
* 1.280 Mm – Diameter of the trans-Neptunian object 50000 Quaoar
* 1.436 Mm – Diameter of Iapetus, one of Saturn's major moons
* 1.578 Mm – Diameter of Titania, the largest of Uranus's moons
* 1.960 Mm – Estimated longest axis of Haumea
* 2.326 Mm – Diameter of the dwarf planet Eris, the largest trans-Neptunian object found to date
* 2.376 Mm – Diameter of Pluto
* 2.707 Mm – Diameter of Triton, largest moon of Neptune
* 3.122 Mm – Diameter of Europa, the smallest Galilean satellite of Jupiter
* 3.476 Mm – Diameter of Earth's Moon
* 3.643 Mm – Diameter of Io, a moon of Jupiter
* 4.821 Mm – Diameter of Callisto, a moon of Jupiter
* 4.879 Mm – Diameter of Mercury
* 5.150 Mm – Diameter of Titan, the largest moon of Saturn
* 5.262 Mm – Diameter of Jupiter's moon Ganymede, the largest moon in the Solar System
* 6.371 Mm – Radius of Earth
* 6.792 Mm – Diameter of Mars

## 10 megametres

Planets from Venus up to Uranus have diameters from ten to one hundred million metres. Top row: Uranus (left), Neptune (right); middle row: Earth (left), Sirius B (center), and Venus (right), to scale

To help compare different orders of magnitude, this section lists lengths starting at 107 metres (10 megametres or 10,000 kilometres).

### Conversions

10 megametres (10 Mm) is

* 6,215 miles
* side of a square of area 100,000,000 square kilometres (km2)
* radius of a circle of area 314,159,265 km2

### Human-defined scales and structures

* 11.085 Mm – Length of the Kyiv-Vladivostok railway, a longer variant of the Trans-Siberian railway[141]
* 13.300 Mm – Length of roads rehabilitated and widened under the National Highway Development Project (launched in 1998) in India
* 39.000 Mm – Length of the SEA-ME-WE 3 optical submarine telecommunications cable, joining 39 points between Norden, Germany and Okinawa, Japan
* 67.000 Mm – Total length of National Highways in India
* 80.000 Mm – 20,000 (metric, French) leagues (see Jules Verne, Twenty Thousand Leagues Under the Sea)

### Geographical

* 10 Mm – Approximate altitude of the outer boundary of the exosphere
* 10.001 Mm – Length of the meridian arc from the North Pole to the Equator (the original definition of the metre was based on this length)
* 60.000 Mm – Total length of the mid-ocean ridges

### Astronomical

* 12.000 Mm – Diameter of Sirius B, a white dwarf[142]
* 12.104 Mm – Diameter of Venus
* 12.742 Mm – Diameter of Earth
* 12.900 Mm – Minimum distance of the meteoroid 2004 FU162 from the centre of Earth on 31 March 2004, closest on record
* 14.000 Mm – Smallest diameter of Jupiter's Great Red Spot
* 19.000 Mm – Separation between Pluto and Charon
* 30.8568 Mm – 1 nanoparsec
* 34.770 Mm – Minimum distance of the asteroid 99942 Apophis on 13 April 2029 from the centre of Earth
* 35.786 Mm – Altitude of geostationary orbit
* 40.005 Mm – Polar circumference of the Earth
* 40.077 Mm – Equatorial circumference of the Earth
* 49.528 Mm – Diameter of Neptune
* 51.118 Mm – Diameter of Uranus

## 100 megametres

The Earth-Moon orbit, Saturn, OGLE-TR-122b, Jupiter, and other objects, to scale. Click on image for detailed view and links to other length scales. Scale model at megametres of the main Solar System bodies.

To help compare different orders of magnitude, this section lists lengths starting at 108 metres (100 megametres or 100,000 kilometres or 62,150 miles).

* 102 Mm – Diameter of HD 149026 b, an unusually dense Jovian planet
* 115 Mm – Width of Saturn's Rings
* 120 Mm – Diameter of EBLM J0555-57Ab, the smallest-known star
* 120 Mm – Diameter of Saturn
* 142 Mm – Diameter of Jupiter, the largest planet in the Solar System
* 170 Mm – Diameter of TRAPPIST-1, a star recently discovered to have seven planets around it
* 174 Mm – Diameter of OGLE-TR-122b
* 180 Mm – Average distance covered during life
* 196 Mm – Diameter of Proxima Centauri, a typical red dwarf
* 257 Mm – Diameter of TrES-4 b
* 272 Mm – Diameter of WASP-12b
* 299.792 Mm – One light-second; the distance light travels in vacuum in one second (see speed of light)
* 300 Mm – Diameter of WASP-79b
* 314 Mm – Diameter of CT Cha b
* 384.4 Mm (238,855 mi) – Average Earth-Moon distance[143]
* 671 Mm – Separation between Jupiter and Europa
* 428 Mm – Diameter of GQ Lupi b, one of the largest-known planets
* 986 Mm – Diameter of HD 100546 b's surrounding disk

## 1 gigametre

13 things in the gigametre group Upper part: Gamma Orionis, Algol B, the Sun (centre), and other objects to scale

; lower part: their darker mirror images (artist's interpretation).

The gigametre (SI symbol: Gm) is a unit of length in the metric system equal to 1000000000 metres (109 m). To help compare different distances this section lists lengths starting at 109 metres (1 gigametre (Gm) or 1 billion metres).

* 1.2 Gm – Separation between Saturn and Titan
* 1.39 Gm – Diameter of Sun[144]
* 1.5 Gm – Orbit from Earth of the James Webb Space Telescope
* 1.71 Gm – Diameter of Alpha Centauri A, one of the closest stars.[145]
* 2.19 Gm – Closest approach of Comet Lexell to Earth, happened on 1 July 1770; closest comet approach on record
* 2.38 Gm – diameter of Sirius A, brightest naked eye star.[146]
* 3 Gm – Total length of "wiring" in the human brain[147]
* 3.5 Gm – Diameter of Vega[148]
* 4.2 Gm – Diameter of Algol B
* 5.0 Gm – Closest approach of Comet Halley to Earth, happened on 10 April 837
* 5.0 Gm – (proposed) Size of the arms of the giant triangle shaped Michelson interferometer of the Laser Interferometer Space Antenna (LISA) planned to start observations sometime in the 2030s.
* 7.9 Gm – Diameter of Gamma Orionis
* 9.0 Gm – Estimated diameter of the event horizon of Sagittarius A*, the supermassive black hole in the center of the Milky Way galaxy

## 10 gigametres

Rigel and Aldebaran (top left and right) compared to smaller stars, the Sun (very small dot in lower middle, with orbit of Mercury as yellow ellipse) and transparent sphere with radius of one light-minute.

To help compare different distances this section lists lengths starting at 1010 metres (10 gigametres (Gm) or 10 million kilometres, or 0.07 astronomical units).

* 12.6 Gm – Diameter of Pollux, the closest red giant star to the Sun[149]
* 15 Gm – Closest distance of Comet Hyakutake from Earth
* 18 Gm – One light-minute (see yellow sphere in right-hand diagram)
* 24 Gm – Radius of a heliostationary orbit
* 30.8568 Gm – 1 microparsec
* ≈35 Gm – Radius of Aldebaran, a red giant star
* ≈35 Gm – Diameter of Arcturus, a close red giant star.[150]
* 46 Gm – Perihelion distance of Mercury (yellow ellipse on the right)
* 55 Gm – 60,000-year perigee of Mars (last achieved on 27 August 2003)
* 55 Gm – Radius of Rigel, a blue supergiant star (largest star on right)[151]
* 58 Gm – Average passing distance between Earth and Mars at the moment they overtake each other in their orbits
* 61 Gm[152] – Diameter of Aldebaran, a red giant star (large star on right)
* 70 Gm – Aphelion distance of Mercury
* 76 Gm – Neso's apocentric distance; greatest distance of a natural satellite from its parent planet (Neptune)

## 100 gigametres

From largest to smallest: Jupiter's orbit, red supergiant star Betelgeuse, Mars' orbit, Earth's orbit, star R Doradus, and orbits of Venus, Mercury. Inside R Doradus's depiction are the blue supergiant star Rigel and red giant star Aldebaran. The faint yellow glow around the Sun represents one light-minute. Click image to see more details and links to their scales.

To help compare distances at different orders of magnitude this section lists lengths starting at 1011 metres (100 gigametre or 100 million kilometres or 0.7 astronomical units).

* 109 Gm (0.7 au) Distance between Venus and the Sun
* 149.6 Gm (93.0 million mi; 1.0 au) – Distance between the Earth and the Sun – the original definition of the astronomical unit
* 180 Gm (1.2 au) – Maximum diameter of Sagittarius A*, the supermassive black hole in the center of Milky Way galaxy
* 228 Gm (1.5 au) – Distance between Mars and the Sun
* ≈280 Gm (1.9 au) – Diameter of Deneb, a blue supergiant and the brightest star in the Cygnus[153]
* 570 Gm (3.8 au) – Length of the tail of Comet Hyakutake measured by Ulysses; the actual value could be much higher
* ≈590 Gm (3.9 au) – Diameter of the Pistol Star, a blue hypergiant star[154]
* 591 Gm (4.0 au) – Minimum distance between the Earth and Jupiter
* 780 Gm (5.2 au) – Distance between Jupiter and the Sun
* 947 Gm (6.4 au) – Diameter of Antares A
* 965 Gm (6.4 au) – Maximum distance between the Earth and Jupiter

## 1 terametre

8 things in the terametre group Comparison of size of the Kuiper belt (large faint torus) with the star VY Canis Majoris (within Saturn's orbit), Betelgeuse (inside Jupiter's orbit) and R Doradus (small central red sphere) together with the orbits of Neptune and Uranus, to scale. The yellow ellipses represent the orbits of each planet and the dwarf planet Pluto.

The terametre (SI symbol: Tm) is a unit of length in the metric system equal to 1000000000000 metres (1012 m). To help compare different distances, this section lists lengths starting at 1012 m (1 Tm or 1 billion km or 6.7 astronomical units).

* ≈1 Tm – 7 au – Diameter of the red supergiant Betelgeuse based on multiple angular diameter estimates[155]
* 1.079 Tm – 7.2 au – One light-hour
* 1.12 Tm – 7.5 au – mean diameter of Rho Cassiopeiae, a rare yellow hypergiant star.[156]
* 1.35 Tm – 9 au – Diameter of the H-alpha emission region around the blue hypergiant P Cygni[157]
* 1.4 Tm – 9.5 au – Distance between Saturn and the Sun
* 1.5 Tm – 10 au – Estimated diameter of VV Cephei A, a red supergiant with a blue dwarf companion.[158]
* 1.75 Tm – 11.7 au – Estimated diameter of Mu Cephei, a red supergiant (possibly hyper giant) among the largest-known stars[159][160]
* 1.83 Tm – 12.2 au – Diameter of HR 5171 A, the largest-known yellow hypergiant star although the latest research suggests it is a red hypergiant with a diameter about 2.1 Tm (14 au)[161][162]
* 2 Tm – 13.2 au – Estimated diameter of VY Canis Majoris, a red hypergiant that is among the largest-known stars[159][163]
* 2.9 Tm – 19.4 au – Distance between Uranus and the Sun
* 4.4 Tm – 29.4 au – Perihelion distance of Pluto
* 4.5 Tm – 30.1 au – Distance between Neptune and the Sun
* 4.5 Tm – 30.1 au – Inner radius of the Kuiper belt
* 5.7 Tm – 38.1 au – Perihelion distance of Eris
* 6.0 Tm – 40.5 au – Distance from Earth at which the Pale Blue Dot photograph was taken.
* 7.3 Tm – 48.8 au – Aphelion distance of Pluto
* 7.5 Tm – 50.1 au – Outer radius of the Kuiper Belt

## 10 terametres

Sedna's orbit (left) is longer than 100 Tm, but other lengths are between 10 and 100 Tm: Comet Hale-Bopp's orbit (lower, faint orange); one light-day (yellow spherical shell with yellow Vernal point arrow as radius); the heliosphere's termination shock (blue shell); and other arrows show positions of Voyager 1 (red) and Pioneer 10 (green). Click on image for larger view and links to other scales.

To help compare different distances this section lists lengths starting at 1013 m (10 Tm or 10 billion km or 67 astronomical units).

* 10 Tm – 67 AU – Diameter of a hypothetical quasi-star
* 11.1 Tm – 74.2 AU – Distance that Voyager 1 began detecting returning particles from termination shock
* 11.4 Tm – 76.2 AU – Perihelion distance of 90377 Sedna
* 12.1 Tm – 70 to 90 AU – Distance to termination shock (Voyager 1 crossed at 94 AU)
* 12.9 Tm – 86.3 AU – Distance to 90377 Sedna in March 2014
* 13.2 Tm – 88.6 AU – Distance to Pioneer 11 in March 2014
* 14.1 Tm – 94.3 AU – Estimated radius of the Solar System
* 14.4 Tm – 96.4 AU – Distance to Eris in March 2014 (now near its aphelion)
* 15.1 Tm – 101 AU – Distance to heliosheath
* 16.5 Tm – 111 AU – Distance to Pioneer 10 as of March 2014
* 16.6 Tm – 111.2 AU – Distance to Voyager 2 as of May 2016
* 20.0 Tm – 135 AU – Distance to Voyager 1 as of May 2016
* 20.6 Tm – 138 AU – Distance to Voyager 1 as of late February 2017
* 21.1 Tm – 141 AU – Distance to Voyager 1 as of November 2017
* 25.9 Tm – 173 AU – One light-day
* 30.8568 Tm – 206.3 AU – 1 milliparsec
* 55.7 Tm – 371 AU – Aphelion distance of the comet Hale-Bopp

## 100 terametres

The largest yellow sphere indicates one light month distance from the Sun. Click the image for larger view, more details and links to other scales.

This list is incomplete; you can help by expanding it.

To help compare different distances this section lists lengths starting at 1014 m (100 Tm or 100 billion km or 670 astronomical units).

* 140 Tm – 937 AU – Aphelion distance of 90377 Sedna
* 172 Tm – 1150 AU – Schwarzschild diameter of H1821+643, one of the most massive black holes known
* 181 Tm – 1210 AU – One light-week
* 308.568 Tm – 2063 AU – 1 centiparsec
* 757 Tm – 5059 AU – radius of the Stingray Nebula[164]
* 777 Tm – 5180 AU – One light-month

## 1 petametre

Largest circle with yellow arrow indicates one light-year from Sun; Cat's Eye Nebula on left and Barnard 68 in middle are depicted in front of Comet 1910 A1's orbit. Click image for larger view, details and links to other scales.

The petametre (SI symbol: Pm) is a unit of length in the metric system equal to 1015 metres. To help compare different distances this section lists lengths starting at 1015 m (1 Pm or 1 trillion km or 6685 astronomical units (AU) or 0.11 light-years).

* 1.0 Pm = 0.105702341 light-years
* 1.9 Pm ± 0.5 Pm = 12,000 AU = 0.2 light-year radius of Cat's Eye Nebula's inner core[165]
* 3.08568 Pm = 20,626 AU = 1 deciparsec
* 4.7 Pm = 30,000 AU = half-light-year diameter of Bok globule Barnard 68[166]
* 7.5 Pm – 50,000 AU – Possible outer boundary of Oort cloud (other estimates are 75,000 to 125,000 or even 189,000 AU (1.18, 2, and 3 light-years, respectively))
* 9.5 Pm – 63,241.1 AU – One light-year, the distance traveled by light in one year
* 9.9 Pm – 66,000 AU – Aphelion distance of the C/1999 F1 (Catalina)

## 10 petametres

Objects with size order of magnitude 1e16m: Ten light-years (94.6 Pm) radius circle with yellow Vernal Point arrow; Bubble Nebula (NGC 7635), left; Dumbbell Nebula (NGC 6853), right; one light-year shell lower right with the smaller Cat's Eye Nebula (NGC_6543) and Barnard 68 adjacent. 1e16m lengths: Ten light-years (94.6 Pm) yellow shell; Sirius below right; BL Ceti below left; Proxima and Alpha Centauri upper right; light-year shell with Comet 1910 A1's orbit inside top right

To help compare different distances this section lists lengths starting at 1016 m (10 Pm or 66,800 AU, 1.06 light-years).

* 15 Pm – 1.59 light-years – Possible outer radius of Oort cloud
* 20 Pm – 2.11 light-years – maximum extent of influence of the Sun's gravitational field[citation needed]
* 30.9 Pm – 3.26 light-years – 1 parsec
* 39.9 Pm – 4.22 light-years – Distance to Proxima Centauri (nearest star to Sun)
* 81.3 Pm – 8.59 light-years – Distance to Sirius

## 100 petametres

Lengths with order of magnitude 1e17m: yellow Vernal Point arrow traces hundred light-year radius circle with smaller ten light-year circle at right; globular cluster Messier 5 in background; 12 light-year radius Orion Nebula middle right; 50-light-year-wide view of the Carina Nebula bottom left; Pleiades cluster and Bubble nebula with similar diameters each around 10 light-years bottom right; grey arrows show distances from Sun to stars Aldebaran (65 light-years) and Vega (25 light-years).

To help compare different distances this section lists lengths between 1017 m (100 Pm or 11 light-years) and 1018 m (106 light-years).

* 110 Pm – 12 light-years – Distance to Tau Ceti
* 230 Pm – 24 light-years – Diameter of the Orion Nebula[167][168]
* 240 Pm – 25 light-years – Distance to Vega
* 260 Pm – 27 light-years – Distance to Chara, a star approximately as bright as the Sun. Its faintness gives an idea how the Sun would appear when viewed from this distance.
* 308.568 Tm – 32.6 light-years – 1 dekaparsec
* 350 Pm – 37 light-years – Distance to Arcturus
* 373.1 Pm – 39.44 light-years – Distance to TRAPPIST-1, a star recently discovered to have 7 planets around it
* 400 Pm – 42 light-years – Distance to Capella
* 620 Pm – 65 light-years – Distance to Aldebaran
* 750 Pm – 79.36 light-years – Distance to Regulus
* 900 Pm – 92.73 light-years – Distance to Algol

## 1 exametre

Lengths with order of magnitude 1e18m: thousand light-year radius circle with yellow arrow and 100 light-year circle at right with globular cluster Messier 5 within and Carina Nebula in front; globular cluster Omega Centauri to left of both; part of the 1,400-light-year-wide Tarantula Nebula fills the background.

The exametre (SI symbol: Em) is a unit of length in the metric system equal to 1018 metres. To help compare different distances this section lists lengths between 1018 m (1 Em or 105.7 light-years) and 1019 m (10 Em or 1,057 light-years).

* 1.2 Em – 129 light-years – Diameter of Messier 13 (a typical globular cluster)
* 1.6 Em – 172 ± 12.5 light-years – Diameter of Omega Centauri (one of the largest-known globular clusters, perhaps containing over a million stars)[169][170]
* 3.08568 Em – 326.1 light-years – 1 hectoparsec
* 3.1 Em – 310 light-years – Distance to Canopus according to Hipparcos[171]
* 6.1 Em – 640 light-years – Distance to Betelgeuse according to Hipparcos[172]
* 6.2 Em – 650 light-years – Distance to the Helix Nebula, located in the constellation Aquarius[173]
* 7.3 Em – 730 light-years – Distance to Rigel according to Hipparcos[171]

## 10 exametres

To help compare different orders of magnitude, this section lists distances starting at 10 Em (1019 m or 1,100 light-years).

* 10.6 Em – 1,120 light-years – Distance to WASP-96b
* 13 Em – 1,300 light-years – Distance to the Orion Nebula[174]
* 14 Em – 1,500 light-years – Approximate thickness of the plane of the Milky Way galaxy at the Sun's location
* 14.2 Em – 1,520 light-years – Diameter of the NGC 604
* 30.8568 Em – 3,261.6 light-years – 1 kiloparsec
* 31 Em – 3,200 light-years – Distance to Deneb according to Hipparcos
* 46 Em – 4,900 light-years – Distance to OGLE-TR-56, the first extrasolar planet discovered using the transit method
* 47 Em – 5,000 light-years – Distance to the Boomerang nebula, coldest place known (1 K)
* 53 Em – 5,600 light-years – Distance to the globular cluster M4 and the extrasolar planet PSR B1620-26 b within it
* 61 Em – 6,500 light-years – Distance to Perseus Spiral Arm (next spiral arm out in the Milky Way galaxy)
* 71 Em – 7,500 light-years – Distance to Eta Carinae

## 100 exametres

To help compare different orders of magnitude, this section lists distances starting at 100 Em (1020 m or 11,000 light-years).

* 150 Em – 16,000 light-years – Diameter of the Small Magellanic Cloud, a dwarf galaxy orbiting the Milky Way
* 200 Em – 21,500 light-years – Distance to OGLE-2005-BLG-390Lb, the most distant and the most Earth-like planet known
* 240 Em – 25,000 light-years – Distance to the Canis Major Dwarf Galaxy
* 260 Em – 28,000 light-years – Distance to the center of the Galaxy
* 400 Em – 48,000 light years – Diameter of the Fireworks Galaxy
* 830 Em – 88,000 light-years – Distance to the Sagittarius Dwarf Elliptical Galaxy

## 1 zettametre

The zettametre (SI symbol: Zm) is a unit of length in the metric system equal to 1021 metres.[52] To help compare different orders of magnitude, this section lists distances starting at 1 Zm (1021 m or 110,000 light-years).

* 1.7 Zm – 179,000 light-years – Distance to the Large Magellanic Cloud, largest satellite galaxy of the Milky Way
* <1.9 Zm – <200,000 light-years – Revised estimated diameter of the disc of the Milky Way Galaxy. The size was previously thought to be half of this.
* 2.0 Zm – 210,000 light-years – Distance to the Small Magellanic Cloud
* 2.8 Zm – 300,000 light-years – Distance to the Intergalactic Wanderer, one of the most distant globular clusters of Milky Way
* 8.5 Zm – 900,000 light-years – Distance to the Leo I Dwarf Galaxy, farthest-known Milky Way satellite galaxy

## 10 zettametres

To help compare different orders of magnitude, this section lists distances starting at 10 Zm (1022 m or 1.1 million light-years).

* 24 Zm – 2.5 million light-years – Distance to the Andromeda Galaxy
* 30.8568 Zm – 3.2616 million light-years – 1 megaparsec
* 40 Zm – 4.2 million light-years – Distance to the IC 10, a distant member of the Local Group of galaxies
* 49.2 Zm – 5.2 million light-years – Width of the Local Group of galaxies
* 95 Zm – 10 million light-years – Distance to the Sculptor Galaxy in the Sculptor Group of galaxies
* 95 Zm – 10 million light-years – Distance to the Maffei 1, the nearest giant elliptical galaxy in the Maffei 1 Group

## 100 zettametres

To help compare different orders of magnitude, this section lists distances starting at 100 Zm (1023 m or 11 million light-years).

* 140 Zm – 15 million light-years – Distance to Centaurus A galaxy
* 250 Zm – 27 million light-years – Distance to the Pinwheel Galaxy
* 280 Zm – 30 million light-years – Distance to the Sombrero Galaxy
* 570 Zm – 60 million light-years – Approximate distance to the Virgo cluster, nearest galaxy cluster
* 620 Zm – 65 million light-years – Approximate distance to the Fornax cluster
* 800 Zm – 85 million light-years – Approximate distance to the Eridanus cluster

## 1 yottametre

The yottametre (SI symbol: Ym) is a unit of length in the metric system equal to 1024 metres.[52]

To help compare different orders of magnitude, this section lists distances starting at 1 Ym (1024 m or 105.702 million light-years).

* 1.2 Ym – 127 million light-years – Distance to the closest observed gamma ray burst GRB 980425
* 1.3 Ym – 137 million light-years – Distance to the Centaurus Cluster of galaxies, the nearest large supercluster
* 1.9 Ym – 201 million light-years – Diameter of the Local Supercluster
* 2.3 Ym – 225 to 250 million light-years – Distance light travels in vacuum in one galactic year
* 2.8 Ym – 296 million light-years – Distance to the Coma Cluster
* 3.15 Ym - 330 million light years - Diameter of the Boötes Void
* 3.2 Ym – 338 million light-years – Distance to Stephan's Quintet
* 4.7 Ym – 496 million light-years – Length of the CfA2 Great Wall, one of the largest observed superstructures in the Universe
* 6.1 Ym – 645 million light-years – Distance to the Shapley Supercluster
* 9.5 Ym – 996 million light-years – Diameter of the Eridanus Supervoid

## 10 yottametres

The universe within one billion light-years of Earth

To help compare different orders of magnitude, this section lists distances starting at 10 Ym (1025 m or 1.1 billion light-years). At this scale, expansion of the universe becomes significant. Distance of these objects are derived from their measured redshifts, which depends on the cosmological models used.

* 13 Ym – 1.37 billion light-years – Length of the South Pole Wall
* 13 Ym – 1.38 billion light-years – Length of the Sloan Great Wall
* 18 Ym – redshift 0.16 – 1.9 billion light-years – Distance to the quasar 3C 273 (light travel distance)
* 30.8568 Ym – 3.2616 billion light-years – 1 gigaparsec
* 31.2204106 Ym − 3.3 billion light-years − Length of The Giant Arc, a large cosmic structure discovered in 2021
* 33 Ym – 3.5 billion light-years – Maximum distance of the 2dF Galaxy Redshift Survey (light travel distance)
* 37.8 Ym – 4 billion light-years – Length of the Huge-LQG
* 75 Ym – redshift 0.95 – 8 billion light-years – Approximate distance to the supernova SN 2002dd in the Hubble Deep Field North (light travel distance)
* 85 Ym – redshift 1.6 – 9 billion light-years – Approximate distance to the gamma-ray burst GRB 990123 (light travel distance)
* 94.6 Ym – 10 billion light-years – Approximate distance to quasar OQ172
* 94.6 Ym – 10 billion light-years – Length of the Hercules–Corona Borealis Great Wall, one of the largest and most massive-known cosmic structures known

## 100 yottametres

To help compare different orders of magnitude, this section lists distances starting at 100 Ym (1026 m or 11 billion light-years). At this scale, expansion of the universe becomes significant. Distance of these objects are derived from their measured redshifts, which depend on the cosmological models used.

* 124 Ym – redshift 7.54 – 13.1 billion light-years – Light travel distance (LTD) to the quasar ULAS J1342+0928, the most distant-known quasar as of 2017
* 130 Ym – redshift 1,000 – 13.8 billion light-years – Distance (LTD) to the source of the cosmic microwave background radiation; radius of the observable universe measured as a LTD
* 260 Ym – 27.4 billion light-years – Diameter of the observable universe (double LTD)
* 440 Ym – 46 billion light-years – Radius of the universe measured as a comoving distance
* 590 Ym – 62 billion light-years – Cosmological event horizon: the largest comoving distance from which light will ever reach us (the observer) at any time in the future
* 886.48 Ym – 93.7 billion light-years – The diameter of the observable universe (twice the particle horizon); however, there might be unobserved distances that are even greater.

## 1 ronnametre

The ronnametre (SI symbol: Rm) is a unit of length in the metric system equal to 1027 metres.[52]

To help compare different orders of magnitude, this section lists distances starting at 1 Rm (1027 m or 110 billion light-years). At this scale, expansion of the universe becomes significant. Distance of these objects are derived from their measured redshifts, which depend on the cosmological models used.

* >1 Rm - >105.7 billion light-years – Size of universe beyond the cosmic light horizon, depending on its curvature; if the curvature is zero (i.e. the universe is spatially flat), the value can be infinite (see Shape of the universe) as previously mentioned
* ≈101010120 Light-years – the possible size of the universe after cosmological inflation

## See also

* List of examples of lengths
* Fermi problem
* Scale (analytical tool)
* Spatial scale

## Notes

1. ↑ The diameter of human hair ranges from 17 to 181 μm Ley, Brian (1999). "Diameter of a human hair". in Elert, Glenn. https://hypertextbook.com/facts/1999/BrianLey.shtml.
2. ↑ 2.0 2.1 The exact category (asteroid, dwarf planet, or planet) to which particular Solar System objects belong, has been subject to some revision since the discovery of extrasolar planets and trans-Neptunian objects
3. ↑ 10115 is 1 followed by 115 zeroes, or a googol multiplied by a quadrillion. 1010115 is 1 followed by a quadrillion googol zeroes. 101010122is 1 followed by 1010122 (a googolplex10 sextillion) zeroes.
4. ↑ But not cloud or high-level fog droplets; droplet size increases with altitude. For a contradictory study indicating larger drop sizes even in ground fog, see Eldridge, Ralph G. (October 1961). "A Few Fog Drop-Size Distributions". Journal of Meteorology 18 (5): 671–6. doi:10.1175/1520-0469(1961)018<0671:AFFDSD>2.0.CO;2. Bibcode: 1961JAtS...18..671E.

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102. ↑ "Law 7 (The pitch)". Marylebone Cricket Club. October 2010. http://www.lords.org/laws-and-spirit/laws-of-cricket/laws/law-7-the-pitch,33,AR.html.
103. ↑ "Animal Records". Smithsonian National Zoological Park. http://nationalzoo.si.edu/Animals/AnimalRecords/.
104. ↑ Curtice, Brian (2021). "New Dry Mesa Dinosaur Quarry Supersaurus vivianae (Jensen 1985) axial elements provide additional insight into its phylogenetic relationships and size, suggesting an animal that exceeded 39 meters in length". https://vertpaleo.org/wp-content/uploads/2021/10/SVP_2021_VirtualBook_final.pdf#page91.
105. ↑ "Longest Animal". Guinness World Records. https://www.guinnessworldrecords.com/world-records/longest-animal/.
106. ↑ "Driver Location Signs – Frequently Asked Questions". Highways Agency. http://www.highways.gov.uk/business/16049.htm.
107. ↑ "Kingda Ka (Six Flags Great Adventure)". https://rcdb.com/2832.htm.
108. ↑ "Eiffel Tower grows six metres after new antenna attached". 15 March 2022. https://www.reuters.com/world/europe/eiffel-tower-grows-six-metres-after-new-antenna-attached-2022-03-15/.
109. ↑ Campbell, Marilyn (17 February 2018). "How Tall is the CN Tower?". TripSavvy. https://www.tripsavvy.com/how-tall-is-the-cn-tower-3251128.
110. ↑ "Burj Dubai all set for 09/09/09 soft opening". Emirates Business 24-7. http://www.business24-7.ae/articles/2009/1/pages/01182009_63dc3a90c9a848219058be301f3f7ded.aspx.
111. ↑ "Tallest tree in the world: coast redwood". https://www.monumentaltrees.com/en/trees/coastredwood/coastredwood/.
112. ↑ "The rubble-pile asteroid Itokawa as observed by Hayabusa". Science 312 (5778): 1330–4. June 2006. doi:10.1126/science.1125841. PMID 16741107. Bibcode: 2006Sci...312.1330F.
113. ↑ "long wave". Oxford Dictionaries. https://en.oxforddictionaries.com/definition/long_wave. "wavelength above one kilometre (and a frequency below 300 kHz)"
114. ↑ "Golden Gate Bridge official website". http://goldengatebridge.org/research/factsGGBDesign.php#length.
115. ↑ "Nautical mile". Merriam-Webster Dictionary. https://www.merriam-webster.com/dictionary/nautical+mile. Retrieved 12 March 2011.
116. ↑ Akashi Kaikyo Bridge @ Everything2.com, Everything2, 9 September 2002, https://everything2.com/title/Akashi%20Kaikyo%20Bridge, retrieved 19 April 2009
117. ↑ Friedl, Jeffrey (9 December 2008), Supporting the Longest Suspension Bridge in the World, http://regex.info/blog/2008-12-09/1021, retrieved 19 April 2009
118. ↑ New height of world's railway born in Tibet, Xinhua News Agency, 24 August 2005, http://news.xinhuanet.com/english/2005-08/24/content_3397297.htm, retrieved 19 April 2009
119. ↑ "GeoNames.org". http://www.geonames.org/3899159/cerro-aucanquilcha.html.
120. ↑ "Russians in landmark Baikal dive". BBC News. 29 July 2008. http://news.bbc.co.uk/2/hi/europe/7530230.stm. "current record of 1,637m was set in Lake Baikal in the 1990s"
121. ↑ "Kosciuszko National Park lookouts and scenery". Office of Environment & Heritage: NSW National Parks & Wildlife Service. https://www.nationalparks.nsw.gov.au/visit-a-park/parks/kosciuszko-national-park#WallacesCreeklookout.
122. ↑ "Carstensz Pyramid details". Carstensz Pyramid Site. http://carstenszpyramid.org/.
123. ↑ "Königreich Frankreich" (in de). 16 September 2009. http://home.fonline.de/fo0126/geschichte/groessen/mas10.htm. (Website based on Alte Meß- und Währungssysteme aus dem deutschen Sprachgebiet, ISBN 3-7686-1036-5)
124. ↑ The Edinburgh Encyclopædia. 12. Edinburgh, UK: William Blackwood, John Waugh, John Murray, Baldwin & Cradock, J. M. Richardson. 1830. p. 494. https://books.google.com/books?id=0bIkTUZAbxcC. Retrieved 9 October 2015.
125. ↑ The Edinburgh Encyclopaedia. 12 (1st American ed.). Joseph and Edward Parker. 1832. https://books.google.com/books?id=17RGAQAAIAAJ&pg=PA572. Retrieved 9 October 2015.
126. ↑ (in de) Polytechnisches Journal. 11. Stuttgart, Germany: J.W. Gotta'schen Buchhandlung. 1823. https://books.google.com/books?id=wF3zAAAAMAAJ&pg=PA500. Retrieved 9 October 2015.
127. ↑ Haugen, Einar, Norwegian English Dictionary, 1965, Oslo: Universitetsforlaget and Madison: University of Wisconsin Press, s.v. mil
128. ↑ "What is a farsakh or farsang?". https://sizes.com/units/farsakh.htm.
129. ↑ "IAAF Competition Rules 2008". IAAF. p. 195. http://www.iaaf.org/mm/Document/imported/42192.pdf.
130. ↑ Kennedy, Gregory. "Stratolab, an Evolutionary Stratospheric Balloon Project". http://stratocat.com.ar/artics/stratolab-e.htm.
131. ↑ Wise, Jeff (1 October 2009). "Turkey Building the World's Deepest Immersed Tube Tunnel". https://www.popularmechanics.com/technology/design/a1689/4217338/.
132. ↑ "Facts and History about the Panama Canal". http://panamacanalfacts.com/facts-about-the-panama-canal/.
133. ↑ Highest and lowest points on Mars NASA
134. ↑ Plescia, Jeff (1 October 1997). "Height of Martian vs. Earth mountains". http://quest.arc.nasa.gov/mars/ask/terrain-geo/Height_of_Martian_vs__Earth_mountains.txt.
135. ↑ "High Speed 1 Project Hoem". Betchel Corporation. https://www.bechtel.com/projects/high-speed-1/.
136. ↑ "Bordeaux-Paris | the event". http://www.bordeauxparis.com/en/the-event/.
137. ↑ "FAQ-Alaska Highway Facts". The MILEPOST. http://www.milepost.com/faq/hwy_drivingfacts.shtml. "1,390 miles ... Alaska Route 2 and often treated as a natural extension of the Alaska Highway"
138. ↑ Downward, R.J.; Bromell, J.E. (March 1990). "Proceedings of the Fourteenth Vertebrate Pest Conference 1990". Proceedings of the Fourteenth Vertebrate Pest Conference 1990. University of Nebraska - Lincoln. http://digitalcommons.unl.edu/vpc14/23/. Retrieved 31 August 2009.
139. ↑ "China's Great Wall far longer than thought: survey". AFP. 20 April 2009. https://www.google.com/hostednews/afp/article/ALeqM5hZntU8l3vH1I21vcievtc-QIryLA.
140. ↑ CIS railway timetable, route No. 002, Moscow-Vladivostok. Archived 3 December 2009.
141. ↑ CIS railway timetable, route No. 350, Kyiv-Vladivostok. Archived 3 December 2009.
142. ↑ McGourty, Christine (14 December 2005). "Hubble finds mass of white dwarf". BBC News. http://news.bbc.co.uk/2/hi/science/nature/4528586.stm.
143. ↑ NASA Staff (10 May 2011). "Solar System Exploration – Earth's Moon: Facts & Figures". NASA. http://solarsystem.nasa.gov/planets/profile.cfm?Display=Facts&Object=Moon.
144. ↑ "Sun Fact Sheet". https://nssdc.gsfc.nasa.gov/planetary/factsheet/sunfact.html.
145. ↑ Akeson, Rachel; Beichman, Charles; Kervella, Pierre; Fomalont, Edward; Benedict, G. Fritz (2021). "Precision Millimeter Astrometry of the α Centauri AB System". The Astronomical Journal 162 (1): 14. doi:10.3847/1538-3881/abfaff. Bibcode: 2021AJ....162...14A.
146. ↑ Liebert, James; Young, Patrick A.; Arnett, David; Holberg, J. B.; Williams, Kurtis A. (2005). "The Age and Progenitor Mass of Sirius B". The Astrophysical Journal 630 (1): L69–L72. doi:10.1086/462419. Bibcode: 2005ApJ...630L..69L.
147. ↑ Neuroscience: The Science of the Brain"IBRO Brain Campaign". http://www.braincampaign.org/Pub/Pub_Main_Display.asp?LC_Docs_ID=2769. p.44
148. ↑ Yoon, Jinmi; Peterson, Deane M.; Kurucz, Robert L.; Zagarello, Robert J. (2010). "A New View of Vega's Composition, Mass, and Age". The Astrophysical Journal 708 (1): 71–79. doi:10.1088/0004-637X/708/1/71. Bibcode: 2010ApJ...708...71Y. https://doi.org/10.1088/0004-637X/708/1/71.
149. ↑ Baines, Ellyn K.; Armstrong, J. Thomas; Schmitt, Henrique R.; Zavala, R. T.; Benson, James A.; Hutter, Donald J.; Tycner, Christopher; Belle, Gerard T. van (2017). "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer". The Astronomical Journal 155: 30. doi:10.3847/1538-3881/aa9d8b.
150. ↑ Ramírez, I.; Allende Prieto, C. (2011). "Fundamental Parameters and Chemical Composition of Arcturus". The Astrophysical Journal 743 (2): 135. doi:10.1088/0004-637X/743/2/135. Bibcode: 2011ApJ...743..135R.
151. ↑ Moravveji, Ehsan; Guinan, Edward F; Shultz, Matt; Williamson, Michael H; Moya, Andres (4 January 2012). "Asteroseismology of the Nearby SN-II Progenitor: Rigel Part I. The MOST High Precision Photometry and Radial Velocity Monitoring". Astrophysical Journal 747 (2): 2. doi:10.1088/0004-637X/747/2/108. Bibcode: 2012ApJ...747..108M.
152. ↑ Richichi, A.; Roccatagliata, V.; Shultz, Matt; Williamson, Michael H.; Moya, Andres (2005). "Aldebaran's angular diameter: How well do we know it?". Astronomy & Astrophysics 433 (1): 305–312. doi:10.1051/0004-6361:20041765. Bibcode: 2005A&A...433..305R. They derived an angular diameter of 20.58±0.03 milliarcsec, which given a distance of 65 light-years yields a diameter of 61 million km.
153. ↑ Chesneau, O.; Dessart, L.; Mourard, D.; Bério, Ph.; Buil, Ch.; Bonneau, D.; Borges Fernandes, M.; Clausse, J. M. et al. (2010). "Time, spatial, and spectral resolution of the H α line-formation region of Deneb and Rigel with the VEGA/CHARA interferometer". Astronomy and Astrophysics 521: A5. doi:10.1051/0004-6361/201014509. Bibcode: 2010A&A...521A...5C.
154. ↑ Lau, R. M.; Herter, T. L.; Morris, M. R.; Adams, J. D. (2014). "Nature Versus Nurture: Luminous Blue Variable Nebulae in and Near Massive Stellar Clusters at the Galactic Center". The Astrophysical Journal 785 (2): 120. doi:10.1088/0004-637X/785/2/120. Bibcode: 2014ApJ...785..120L.
155. ↑ Joyce, Meridith; Leung, Shing-Chi; Molnár, László; Ireland, Michael; Kobayashi, Chiaki; Nomoto, Ken'Ichi (2020). "Standing on the Shoulders of Giants: New Mass and Distance Estimates for Betelgeuse through Combined Evolutionary, Asteroseismic, and Hydrodynamic Simulations with MESA". The Astrophysical Journal 902 (1): 63. doi:10.3847/1538-4357/abb8db. Bibcode: 2020ApJ...902...63J.
156. ↑ Van Genderen, A. M.; Lobel, A.; Nieuwenhuijzen, H.; Henry, G. W.; De Jager, C.; Blown, E.; Di Scala, G.; Van Ballegoij, E. J. (2019). "Pulsations, eruptions, and evolution of four yellow hypergiants". Astronomy & Astrophysics 631: A48. doi:10.1051/0004-6361/201834358. Bibcode: 2019A&A...631A..48V.
157. ↑ Balan, Aurelian; Tycner, C.; Zavala, R. T.; Benson, J. A.; Hutter, D. J.; Templeton, M. (2010). "THE SPATIALLY RESOLVED Hα-EMITTING WIND STRUCTURE OF P CYGNI". The Astronomical Journal 139 (6): 2269–2278. doi:10.1088/0004-6256/139/6/2269. Bibcode: 2010AJ....139.2269B.
158. ↑ Bauer, W. H.; Gull, T. R.; Bennett, P. D. (2008). "Spatial Extension in the Ultraviolet Spectrum of Vv Cephei". The Astronomical Journal 136 (3): 1312. doi:10.1088/0004-6256/136/3/1312. Bibcode: 2008AJ....136.1312H.
159. ↑ 159.0 159.1 Shenoy, Dinesh; Humphreys, Roberta M.; Jones, Terry J.; Marengo, Massimo; Gehrz, Robert D.; Helton, L. Andrew; Hoffmann, William F.; Skemer, Andrew J. et al. (2016). "SEARCHING FOR COOL DUST IN THE MID-TO-FAR INFRARED: THE MASS-LOSS HISTORIES OF THE HYPERGIANTS μ Cep, VY CMa, IRC+10420, AND ρ Cas". The Astronomical Journal 151 (3): 51. doi:10.3847/0004-6256/151/3/51. Bibcode: 2016AJ....151...51S.
160. ↑ Kravchenko, K.; Chiavassa, A.; Van Eck, S.; Jorissen, A.; Merle, T.; Freytag, B.; Plez, B. (2019). "Tomography of cool giant and supergiant star atmospheres". Astronomy & Astrophysics 632: A28. doi:10.1051/0004-6361/201935809.
161. ↑ Chesneau, O.; Meilland, A.; Chapellier, E.; Millour, F.; Van Genderen, A. M.; Nazé, Y.; Smith, N.; Spang, A. et al. (2014). "The yellow hypergiant HR 5171 A: Resolving a massive interacting binary in the common envelope phase". Astronomy & Astrophysics 563: A71. doi:10.1051/0004-6361/201322421. Bibcode: 2014A&A...563A..71C.
162. ↑ Wittkowski, M; Abellan, F. J; Arroyo-Torres, B; Chiavassa, A; Guirado, J. C; Marcaide, J. M; Alberdi, A; De Wit, W. J et al. (28 September 2017). "Multi-epoch VLTI-PIONIER imaging of the supergiant V766 Cen: Image of the close companion in front of the primary". Astronomy & Astrophysics 1709: L1. doi:10.1051/0004-6361/201731569. Bibcode: 2017A&A...606L...1W.
163. ↑ Wittkowski, M.; Hauschildt, P.H.; Arroyo-Torres, B.; Marcaide, J.M. (5 April 2012). "Fundamental properties and atmospheric structure of the red supergiant VY CMa based on VLTI/AMBER spectro-interferometry". Astronomy & Astrophysics 540: L12. doi:10.1051/0004-6361/201219126. Bibcode: 2012A&A...540L..12W.
164. ↑ Parthasarathy, M. (2000). "Birth and early evolution of planetary nebulae". Bulletin of the Astronomical Society of India 28: 217–224. Bibcode: 2000BASI...28..217P.
165. ↑ radius = distance times sin(angular diameter/2) = 0.2 light-year. Distance = 3.3 ± 0.9 kly; angular diameter = 20 [[arcsec Orders of magnitude (length)onds]](Reed Balick)
166. ↑ Szpir, Michael (May–June 2001). "Bart Bok's Black Blobs". American Scientist. http://www.americanscientist.org/template/AssetDetail/assetid/14678. "Bok globules such as Barnard 68 are only about half a light-year across and weigh in at about two solar masses"
167. ↑ Sandstrom, Karin M; Peek, J. E. G.; Bower, Geoffrey C.; Bolatto, Alberto D.; Plambeck, Richard L. (1999). "A Parallactic Distance of 389+24
−21 parsecs to the Orion Nebula Cluster from Very Long Baseline Array Observations". The Astrophysical Journal 667 (2): 1161–1169. doi:10.1086/520922. Bibcode: 2007ApJ...667.1161S.389+24−21+parsecs+to+the+Orion+Nebula+Cluster+from+Very+Long+Baseline+Array+Observations&rft.jtitle=The+Astrophysical+Journal&rft.aulast=Sandstrom&rft.aufirst=Karin+M&rft.au=Sandstrom, Karin+M&rft.au=Peek,+J.+E.+G.&rft.au=Bower,+Geoffrey+C.&rft.au=Bolatto,+Alberto+D.&rft.au=Plambeck,+Richard+L.&rft.date=1999&rft.volume=667&rft.issue=2&rft.pages=1161–1169&rft_id=info:doi/10.1086/520922&rft_id=info:bibcode/2007ApJ...667.1161S&rfr_id=info:sid/en.wikibooks.org:Orders_of_magnitude_(length)">
168. ↑ diameter=sin(65 arcminutes)*1270 light-years=24; where "65.00 × 60.0 (arcmin)" sourced from Revised NGC Data for NGC 1976
169. ↑ distance × sin( diameter_angle ), using distance of 5kpc (15.8 ± 1.1 kly) and angle 36.3', = 172 ± 12.5 ly.
170. ↑ van de Ven, G.; van den Bosch, R. C. E.; Verolme, E. K.; de Zeeuw, P. T. (2006). "The dynamical distance and intrinsic structure of the globular cluster ω Centauri". Astronomy and Astrophysics 445 (2): 513–543. doi:10.1051/0004-6361:20053061. Bibcode: 2006A&A...445..513V. "best-fit dynamical distance D=4.8±0.3 kpc ... consistent with the canonical value 5.0±0.2 kpc obtained by photometric methods".
171. ↑ 171.0 171.1 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. Vizier catalog entry
172. ↑ Harper, Graham M.; Brown, Alexander; Guinan, Edward F. (April 2008). "A New VLA-Hipparcos Distance to Betelgeuse and its Implications". The Astronomical Journal 135 (4): 1430–40. doi:10.1088/0004-6256/135/4/1430. Bibcode: 2008AJ....135.1430H.
173. ↑ Harris, Hugh C.; Dahn, Conard C.; Canzian, Blaise; Guetter, Harry H. et al. (2007). "Trigonometric Parallaxes of Central Stars of Planetary Nebulae". The Astronomical Journal 133 (2): 631–638. doi:10.1086/510348. Bibcode: 2007AJ....133..631H.
174. ↑ Reid, M. J. et al. (2009). "Trigonometric Parallaxes of Massive Star Forming Regions: VI. Galactic Structure, Fundamental Parameters and Non-Circular Motions". Astrophysical Journal 700 (1): 137–148. doi:10.1088/0004-637X/700/1/137. Bibcode: 2009ApJ...700..137R.

## External links

* How Big Are Things? – displays orders of magnitude in successively larger rooms.
* Powers of Ten – Travel across the Universe.
* Cosmos – Journey from microcosmos to macrocosmos (Digital Nature Agency).
* Scale of the universe – interactive guide to length magnitudes
* Video (4:29) on YouTube – Orders of Magnitude (March 2020).

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Orders of magnitude

Quantity|

* Acceleration
* Angular momentum
* Angular velocity
* Area
* Bit rate
* Capacitance
* Charge
* Computing
* Currency
* Current
* Data
* Density
* Energy / Energy density / Energy flow density
* Entropy
* Force
* Frequency
* Inductance
* Illuminance
* Length
* Luminance / Luminous flux
* Magnetic field
* Mass
* Molarity
* Momentum
* Numbers
* Power
* Pressure
* Probability
* Radiation
* Resistance
* Sound pressure
* Specific energy
* Specific heat capacity
* Speed
* Temperature
* Time
* Viscosity
* Voltage
* Volume

See also|

* Back-of-the-envelope calculation
* Fermi problem
* Powers of 10 and decades
* 10th
* 100th
* 1000000th
* Billionth
* Trillionth
* Metric (SI) prefix
* Macroscopic scale
* Microscopic scale
* Quantum realm

Related|

* Astronomical system of units
* Earth's location in the Universe
* "Cosmic View" (1957 essay)
* To the Moon and Beyond (1964 film)
* Cosmic Zoom (1968 film)
* Powers of Ten (1968 and 1977 films)
* Cosmic Voyage (1996 documentary)
* Cosmic Eye (2012)

* Book
* Category

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Units of length used in Astronomy

* Astronomical system of units

* Earth radius (R⊕ or RE)
* Light-second (ls)
* Solar radius (R☉)
* gigametre (Gm)
* Astronomical unit (au)
* terametre (Tm)
* light-year (ly)
* parsec (pc)
* kiloparsec (kpc)
* megaparsec (Mpc)
* gigaparsec (Gpc)

See also
Cosmic distance ladder
Orders of magnitude (length)
Conversion of units

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