Location of Earth

Short description: Location of Earth in the Universe

Template:EarthsLocation imagemap

Knowledge of the location of Earth has been shaped by 400 years of telescopic observations, and has expanded radically since the start of the 20th century. Initially, Earth was believed to be the center of the Universe, which consisted only of those planets visible with the naked eye and an outlying sphere of fixed stars.[1] After the acceptance of the heliocentric model in the 17th century, observations by William Herschel and others showed that the Sun lay within a vast, disc-shaped galaxy of stars.[2] By the 20th century, observations of spiral nebulae revealed that the Milky Way galaxy was one of billions in an expanding universe,[3][4] grouped into clusters and superclusters. By the end of the 20th century, the overall structure of the visible universe was becoming clearer, with superclusters forming into a vast web of filaments and voids.[5] Superclusters, filaments and voids are the largest coherent structures in the Universe that we can observe.[6] At still larger scales (over 1000 megaparsecs[lower-alpha 1]) the Universe becomes homogeneous, meaning that all its parts have on average the same density, composition and structure.[7]

Since there is believed to be no "center" or "edge" of the Universe, there is no particular reference point with which to plot the overall location of Earth in the universe.[8] Because the observable universe is defined as that region of the Universe visible to terrestrial observers, Earth is, because of the constancy of the speed of light, the center of Earth's observable universe. Reference can be made to Earth's position with respect to specific structures, which exist at various scales. It is still undetermined whether the Universe is infinite. There have been numerous hypotheses that the known universe may be only one such example within a higher multiverse; however, no direct evidence of any sort of multiverse has been observed, and some have argued that the hypothesis is not falsifiable.[9][10]

## Contents

* 1 Details
* 2 Table
* 3 Gallery
* 4 See also
* 5 Notes
* 6 References

## Details

Earth is the third planet from the Sun with an approximate distance of 149.6 million kilometres (93.0 million miles), and is traveling nearly 2.1 million kilometres per hour (1.3 million miles per hour) through outer space.[11]

## Table

Feature | Diameter | Notes | Sources

|
|
|

(most suitable unit)  | (km, with scientific notation)  |
Earth | 12,756.2 km
(equatorial)  | 1.28×104 | Measurement comprises just the solid part of Earth; there is no agreed upper boundary for Earth's atmosphere.
The geocorona, a layer of UV-luminescent hydrogen atoms, lies at 100,000 km.
The Kármán line, defined as the boundary of space for astronautics, lies at 100 km. | [12][13][14][15]
Orbit of the Moon | 768,210 km[lower-alpha 2] | 7.68×105 | The average diameter of the orbit of the Moon relative to Earth. | [16]
Geospace | 6,363,000–12,663,000 km
(110–210 Earth radii)  | 6.36×106–1.27×107 | The space dominated by Earth's magnetic field and its magnetotail, shaped by the solar wind. | [17]
Earth's orbit | 299.2 million km[lower-alpha 2]
2 AU[lower-alpha 3] | 2.99×108 | The average diameter of the orbit of Earth relative to the Sun.
Encompasses the Sun, Mercury and Venus. | [18]
Inner Solar System | ~6.54 AU  | 9.78×108 | Encompasses the Sun, the inner planets (Mercury, Venus, Earth, Mars) and the asteroid belt.
Cited distance is the 2:1 resonance with Jupiter, which marks the outer limit of the asteroid belt. | [19][20][21]
Outer Solar System | 60.14 AU  | 9.00×109 | Includes the outer planets (Jupiter, Saturn, Uranus, Neptune).
Cited distance is the orbital diameter of Neptune. | [22]
Kuiper belt | ~96 AU  | 1.44×1010 | Belt of icy objects surrounding the outer Solar System. Encompasses the dwarf planets Pluto, Haumea and Makemake.
Cited distance is the 2:1 resonance with Neptune, generally regarded as the outer edge of the main Kuiper belt. | [23]
Heliosphere | 160 AU  | 2.39×1010 | Maximum extent of the solar wind and the interplanetary medium. | [24][25]
Scattered disc | 195.3 AU  | 2.92×1010 | Region of sparsely scattered icy objects surrounding the Kuiper belt. Encompasses the dwarf planet Eris.
Cited distance is derived by doubling the aphelion of Eris, the farthest known scattered disc object.
As of now, Eris's aphelion marks the farthest known point in the scattered disc. | [26]
Oort cloud | 100,000–200,000 AU
0.613–1.23 pc[lower-alpha 1] | 1.89×1013–3.80×1013 | Spherical shell of over a trillion (1012) comets. Existence is currently hypothetical, but inferred from the orbits of long-period comets. | [27]
Solar System | 1.23 pc  | 3.80×1013 | The Sun and its planetary system. Cited diameter is that of the Sun's Hill sphere; the region of its gravitational influence. | [28]
Local Interstellar Cloud | 9.2 pc  | 2.84×1014 | Interstellar cloud of gas through which the Sun and a number of other stars are currently traveling. | [29]
Local Bubble | 2.82–250 pc  | 8.70×1013–7.71×1015 | Cavity in the interstellar medium in which the Sun and a number of other stars are currently traveling.
Caused by a past supernova. | [30][31]
Radcliffe wave | 2,700 pc  | 8.33×1016 | Gaseous structure running parallel to the Milky Way's arms which contains several regions of star formation. It overlaps with the Gould Belt. | [32][33]
Orion Arm | 6,100 pc
(length)  | 1.88×1017 | The spiral arm of the Milky Way Galaxy through which the Sun is currently travelling. | [34]
Orbit of the Solar System | 17,200 pc  | 5.31×1017 | The average diameter of the orbit of the Solar System relative to the Galactic Center.
The Sun's orbital radius is roughly 8,600 parsecs, or slightly over halfway to the galactic edge.
One orbital period of the Solar System lasts between 225 and 250 million years. | [35][36]
Milky Way Galaxy | 30,000 pc  | 9.26×1017 | Earth's home galaxy, composed of 200 billion to 400 billion stars and filled with the interstellar medium. | [37][38]
Milky Way subgroup | 840,500 pc  | 2.59×1019 | The Milky Way and those satellite dwarf galaxies gravitationally bound to it.
Examples include the Sagittarius Dwarf, the Ursa Minor Dwarf and the Canis Major Dwarf.
Cited distance is the orbital diameter of the Leo T Dwarf galaxy, the most distant galaxy in the Milky Way subgroup. Currently 59 satellite galaxies are part of the subgroup. | [39]
Local Group | 3 Mpc[lower-alpha 1] | 9.26×1019 | Group of at least 80 galaxies of which the Milky Way is a part.
Dominated by Andromeda (the largest), the Milky Way and Triangulum; the remainder are dwarf galaxies. | [40]
Local Sheet | 7 Mpc  | 2.16×1020 | Group of galaxies including the Local Group moving at the same relative velocity towards the Virgo Cluster and away from the Local Void. | [41][42]
Virgo Supercluster | 30 Mpc  | 9.26×1020 | The supercluster of which the Local Group is a part.
It comprises roughly 100 galaxy groups and clusters, centred on the Virgo Cluster.
The Local Group is located on the outer edge of the Virgo Supercluster. | [43][44]
Laniakea Supercluster | 160 Mpc  | 4.94×1021 | A group connected with the superclusters of which the Local Group is a part.
Comprises roughly 300 to 500 galaxy groups and clusters, centred on the Great Attractor in the Hydra–Centaurus Supercluster. | [45][46][47][48]
Pisces–Cetus Supercluster Complex | 330 Mpc  | 1×1022 | Galaxy filament that includes the Pisces-Cetus Superclusters, Perseus–Pisces Supercluster, Sculptor Supercluster and associated smaller filamentary chains. | [49][50]
Observable Universe | 28,500 Mpc  | 8.79×1023 | At least 2 trillion galaxies in the observable universe, arranged in millions of superclusters, galactic filaments, and voids, creating a foam-like superstructure. | [51][52][53][54]
Universe | ≫28,500 Mpc
(possibly infinite)  | ≫8.79×1023 | Beyond the observable universe lie the unobservable regions from which no light has yet reached Earth.
No information is available, as light is the fastest travelling medium of information.
However, uniformitarianism argues that the Universe is likely to contain more galaxies in the same foam-like superstructure. | [55]

## Gallery

Logarithmic depiction of Earth's location

Location of Earth in the Universe

Earth-Moon System

Inner Solar System with Near-Earth objects

Solar System and Oort cloud

Nearest stars

Local Interstellar Cloud and neighbouring interstellar medium

Star associations and interstellar medium map of the Local Bubble

Molecular clouds around the Sun inside the Orion-Cygnus Arm

Orion-Cygnus Arm and neighbouring arms

Orion-Cygnus Arm inside the Milky Way

The Sun within the structure of the Milky Way

Satellite galaxies of the Milky Way in Local Group

Virgo SCl in Laniakea SCl

Laniakea SCl in Pisces–Cetus Supercluster Complex

Observable Universe of the Universe

Error: No valid link was found at the end of line 3.

A logarithmic map of the observable universe. From left to right, spacecraft and celestial bodies are arranged according to their proximity to Earth.

Stereoscopic view of the universe (805 x 416) for cross-eyed viewing Gaia DR3 maps

## See also

* Cosmic View
* Cosmic Zoom
* "Galaxy Song"
* Center of the universe
* Orders of magnitude (length)
* Pale Blue Dot
* Powers of Ten (film)
* List of nearest stars and brown dwarfs
* Solar System § Galactic context

## Notes

1. ↑ 1.0 1.1 1.2 A parsec (pc) is the distance at which a star's parallax as viewed from Earth is equal to one second of arc, equal to roughly 206,000 AU or 3.0857×1013 km. One megaparsec (Mpc) is equivalent to one million parsecs.
2. ↑ 2.0 2.1 Semi-major and semi-minor axes.
3. ↑ 1 AU or astronomical unit is the distance between Earth and the Sun, or 150 million km. Earth's orbital diameter is twice its orbital radius, or 2 AU.

## References

1. ↑ Kuhn, Thomas S. (1957). The Copernican Revolution. Harvard University Press. pp. 5–20. ISBN 978-0-674-17103-9. https://archive.org/details/copernicanrevolu0008kuhn.
2. ↑ "1781: William Herschel Reveals the Shape of our Galaxy". Carnegie Institution for Science. http://cosmology.carnegiescience.edu/timeline/1781.
3. ↑ "The Spiral Nebulae and the Great Debate". Eberly College of Science. https://www.e-education.psu.edu/astro801/content/l9_p2.html.
4. ↑ "1929: Edwin Hubble Discovers the Universe is Expanding". Carnegie Institution for Science. https://cosmology.carnegiescience.edu/timeline/1929.
5. ↑ "1989: Margaret Geller and John Huchra Map the Universe". Carnegie Institution for Science. https://cosmology.carnegiescience.edu/timeline/1989.
6. ↑ Villanueva, John Carl (2009). "Structure of the Universe". Universe Today. http://www.universetoday.com/37360/structure-of-the-universe/.
7. ↑ Kirshner, Robert P. (2002). The Extravagant Universe: Exploding Stars, Dark Energy and the Accelerating Cosmos. Princeton University Press. p. 71. ISBN 978-0-691-05862-7. https://archive.org/details/extravagantunive00kirs.
8. ↑ Mainzer, Klaus; Eisinger, J. (2002). The Little Book of Time. Springer. p. 55. ISBN 978-0-387-95288-8. https://books.google.com/books?id=wX111YnexSUC&pg=PA55.
9. ↑ Moskowitz, Clara (2012). "5 Reasons We May Live in a Multiverse". space.com. http://www.space.com/18811-multiple-universes-5-theories.html.
10. ↑ Kragh, H. (2009). "Contemporary History of Cosmology and the Controversy over the Multiverse". Annals of Science 66 (4): 529–551. doi:10.1080/00033790903047725.
11. ↑ Fraknoi, Andrew (2007). "How Fast Are You Moving When You Are Sitting Still?". NASA. https://nightsky.jpl.nasa.gov/docs/HowFast.pdf.
NOTE: Estimated velocity of Earth traveling through outer space may be between 1.3–3.1 million kilometres per hour (0.8–1.9 million miles per hour) – see discussion at "Wikipedia:Reference desk/Archives/Science/2019 July 20#How fast are we moving through space?"
12. ↑ "Selected Astronomical Constants, 2011". The Astronomical Almanac. http://asa.usno.navy.mil/SecK/2011/Astronomical_Constants_2011.txt.
13. ↑ World Geodetic System (WGS-84). Available online from National Geospatial-Intelligence Agency Retrieved 27 April 2015.
14. ↑ "Exosphere – overview". University Corporation for Atmospheric Research. 2011. http://scied.ucar.edu/shortcontent/exosphere-overview.
15. ↑ S. Sanz Fernández de Córdoba (24 June 2004). "The 100 km Boundary for Astronautics". Fédération Aéronautique Internationale. http://www.fai.org/icare-records/100km-altitude-boundary-for-astronautics.
16. ↑ NASA Moon Factsheet and NASA Solar System Exploration Moon Factsheet NASA Retrieved on 17 November 2008
17. ↑ Koskinen, Hannu (2010), Physics of Space Storms: From the Surface of the Sun to the Earth, Environmental Sciences Series, Springer, ISBN 978-3-642-00310-3, https://books.google.com/books?id=cO0nwfhXVjUC&pg=PA32
18. ↑ "Earth Fact Sheet". NASA. http://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html. and "Earth: Facts & Figures". NASA. http://sse.jpl.nasa.gov/planets/profile.cfm?Object=Earth&Display=Facts&System=Metric.
19. ↑ Petit, J.-M.; Morbidelli, A.; Chambers, J. (2001). "The Primordial Excitation and Clearing of the Asteroid Belt". Icarus 153 (2): 338–347. doi:10.1006/icar.2001.6702. Bibcode: 2001Icar..153..338P. http://www.gps.caltech.edu/classes/ge133/reading/asteroids.pdf. Retrieved 22 March 2007.
20. ↑ Roig, F.; Nesvorný, D.; Ferraz-Mello, S. (2002). "Asteroids in the 2: 1 resonance with Jupiter: dynamics and size distribution". Monthly Notices of the Royal Astronomical Society 335 (2): 417–431. doi:10.1046/j.1365-8711.2002.05635.x. Bibcode: 2002MNRAS.335..417R.
21. ↑ Brož, M; Vokrouhlický, D; Roig, F; Nesvorný, D; Bottke, W. F; Morbidelli, A (2005). "Yarkovsky origin of the unstable asteroids in the 2/1 mean motionresonance with Jupiter". Monthly Notices of the Royal Astronomical Society 359 (4): 1437–1455. doi:10.1111/j.1365-2966.2005.08995.x. Bibcode: 2005MNRAS.359.1437B.
22. ↑ NASA Neptune factsheet and NASA Solar System Exploration Neptune Factsheet NASA Retrieved on 17 November 2008
23. ↑ De Sanctis, M. C; Capria, M. T; Coradini, A (2001). "Thermal Evolution and Differentiation of Edgeworth–Kuiper Belt Objects". The Astronomical Journal 121 (5): 2792–2799. doi:10.1086/320385. Bibcode: 2001AJ....121.2792D.
24. ↑ NASA/JPL (2009). "Cassini's Big Sky: The View from the Center of Our Solar System". http://www.jpl.nasa.gov/news/features.cfm?feature=2370&msource=F20091119&tr=y&auid=5615216.
25. ↑ Fahr, H. J.; Kausch, T.; Scherer, H. (2000). "A 5-fluid hydrodynamic approach to model the Solar System-interstellar medium interaction". Astronomy & Astrophysics 357: 268. Bibcode: 2000A&A...357..268F. http://aa.springer.de/papers/0357001/2300268.pdf. Retrieved 3 October 2009. See Figures 1 and 2.
26. ↑ "JPL Small-Body Database Browser: 136199 Eris (2003 UB313)". http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=Eris.
27. ↑ Morbidelli, Alessandro (2005). "Origin and dynamical evolution of comets and their reservoir". arXiv:astro-ph/0512256.
28. ↑ Littmann, Mark (2004). Planets Beyond: Discovering the Outer Solar System. Courier Dover Publications. pp. 162–163. ISBN 978-0-486-43602-9. https://archive.org/details/planetsbeyonddis00mlit.
29. ↑ Mark Anderson, "Don't stop till you get to the Fluff", New Scientist no. 2585, 6 January 2007, pp. 26–30
30. ↑ Seifr, D.M. (1999). "Mapping the Countours of the Local Bubble". Astronomy and Astrophysics 346: 785–797. Bibcode: 1999A&A...346..785S.
31. ↑ Phillips, Tony (2014). "Evidence for Supernovas Near Earth". NASA. https://science.nasa.gov/science-news/science-at-nasa/2014/26aug_localbubble/.
32. ↑ "Astronomers discover huge gaseous wave holding Milky Way's newest stars". The Guardian. 7 January 2020. ISSN 0261-3077. https://www.theguardian.com/science/2020/jan/07/astronomers-discover-huge-gaseous-wave-holding-milky-ways-newest-stars.
33. ↑ Rincon, Paul (7 January 2020). "Vast 'star nursery' region found in our galaxy". https://www.bbc.com/news/science-environment-51021704.
34. ↑ Xu, Ye; Reid, Mark; Dame, Thomas; Menten, Karl; Sakai, Nobuyuki; Li, Jingjing; Brunthaler, Andreas; Moscadelli, Luca et al. (28 September 2016). "The local spiral structure of the Milky Way". Science Advances 2 (9). doi:10.1126/sciadv.1600878. PMID 27704048. Bibcode: 2016SciA....2E0878X.
35. ↑ Eisenhauer, F.; Schoedel, R.; Genzel, R.; Ott, T.; Tecza, M.; Abuter, R.; Eckart, A.; Alexander, T. (2003). "A Geometric Determination of the Distance to the Galactic Center". Astrophysical Journal 597 (2): L121–L124. doi:10.1086/380188. Bibcode: 2003ApJ...597L.121E.
36. ↑ Leong, Stacy (2002). "Period of the Sun's Orbit around the Galaxy (Cosmic Year)". The Physics Factbook. http://hypertextbook.com/facts/2002/StacyLeong.shtml.
37. ↑ Christian, Eric; Samar, Safi-Harb. "How large is the Milky Way?". NASA. http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/980317b.html.
38. ↑ "The Milky Way Galaxy". SEDS. 25 August 2005. http://messier.seds.org/more/mw.html.
39. ↑ Irwin, V. et al. (2007). "Discovery of an Unusual Dwarf Galaxy in the Outskirts of the Milky Way". The Astrophysical Journal 656 (1): L13–L16. doi:10.1086/512183. Bibcode: 2007ApJ...656L..13I.
40. ↑ "The Local Group of Galaxies". University of Arizona. Students for the Exploration and Development of Space. http://messier.seds.org/more/local.html.
41. ↑ Tully, R. Brent; Shaya, Edward J.; Karachentsev, Igor D.; Courtois, Hélène M.; Kocevski, Dale D.; Rizzi, Luca; Peel, Alan (March 2008). "Our Peculiar Motion Away from the Local Void". The Astrophysical Journal 676 (1): 184–205. doi:10.1086/527428. Bibcode: 2008ApJ...676..184T.
42. ↑ Tully, R. Brent (May 2008). "The Local Void is Really Empty". Dark Galaxies and Lost Baryons, Proceedings of the International Astronomical Union, IAU Symposium. 244. pp. 146–151. doi:10.1017/S1743921307013932. Bibcode: 2008IAUS..244..146T.
43. ↑ Tully, R. Brent (1982). "The Local Supercluster". The Astrophysical Journal 257: 389–422. doi:10.1086/159999. Bibcode: 1982ApJ...257..389T.
44. ↑ "Galaxies, Clusters, and Superclusters". NOVA Online. https://www.pbs.org/wgbh/nova/universe/tour_ggs.html.
45. ↑ "Newly identified galactic supercluster is home to the Milky Way". National Radio Astronomy Observatory (ScienceDaily). 3 September 2014. https://www.sciencedaily.com/releases/2014/09/140903133319.htm.
46. ↑ Klotz, Irene (3 September 2014). "New map shows Milky Way lives in Laniakea galaxy complex". Reuters. ScienceDaily. https://www.reuters.com/article/us-space-galaxies-idUSKBN0GY2C820140903.
47. ↑ Gibney, Elizabeth (3 September 2014). "Earth's new address: 'Solar System, Milky Way, Laniakea'". Nature. doi:10.1038/nature.2014.15819. http://www.nature.com/news/earth-s-new-address-solar-system-milky-way-laniakea-1.15819.
48. ↑ Carlisle, Camille M. (3 September 2014). "Laniakea: Our Home Supercluster". Sky and Telescope. http://www.skyandtelescope.com/astronomy-news/laniakea-home-supercluster-09032014/.
49. ↑ Tully, R. B. (1986-04-01). "Alignment of clusters and galaxies on scales up to 0.1 C". The Astrophysical Journal 303: 25–38. doi:10.1086/164049. Bibcode: 1986ApJ...303...25T.
50. ↑ Tully, R. Brent (1987-12-01). "More about clustering on a scale of 0.1 C". The Astrophysical Journal 323: 1–18. doi:10.1086/165803. Bibcode: 1987ApJ...323....1T.
51. ↑ Mackie, Glen (1 February 2002). "To see the Universe in a Grain of Taranaki Sand". Swinburne University. http://astronomy.swin.edu.au/~gmackie/billions.html.
52. ↑ Lineweaver, Charles; Davis, Tamara M. (2005). "Misconceptions about the Big Bang". Scientific American. http://www.sciam.com/article.cfm?id=misconceptions-about-the-2005-03&page=5. Retrieved 6 November 2008.
53. ↑ Conselice, Christopher J.; Wilkinson, Aaron; Duncan, Kenneth; Mortlock, Alice (13 October 2016). "The Evolution of Galaxy Number Density at z < 8 and its Implications". The Astrophysical Journal 830 (2): 83. doi:10.3847/0004-637X/830/2/83. ISSN 1538-4357. Bibcode: 2016ApJ...830...83C.
54. ↑ "Two Trillion Galaxies, at the Very Least". The New York Times. 17 October 2016. https://www.nytimes.com/2016/10/18/science/two-trillion-galaxies-at-the-very-least.html.
55. ↑ Margalef-Bentabol, Berta; Margalef-Bentabol, Juan; Cepa, Jordi (February 2013). "Evolution of the cosmological horizons in a universe with countably infinitely many state equations". Journal of Cosmology and Astroparticle Physics. 015 2013 (2): 015. doi:10.1088/1475-7516/2013/02/015. Bibcode: 2013JCAP...02..015M.

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