Robotic spacecraft

Short description: Uncrewed spacecraft, usually under telerobotic control

An artist's interpretation of the MESSENGER spacecraft at Mercury

A robotic spacecraft is an uncrewed spacecraft, usually under telerobotic control. A robotic spacecraft designed to make scientific research measurements is often called a space probe. Many space missions are more suited to telerobotic rather than crewed operation, due to lower cost and lower risk factors. In addition, some planetary destinations such as Venus or the vicinity of Jupiter are too hostile for human survival, given current technology. Outer planets such as Saturn, Uranus, and Neptune are too distant to reach with current crewed spacecraft technology, so telerobotic probes are the only way to explore them.

Nearly all satellites, landers and rovers are robotic spacecraft.

## Contents

* 1 History
* 1.1 Structure
* 1.2 Data handling
* 1.3 Attitude determination and control
* 1.4 Landing on hazardous terrain
* 1.5 Entry, descent, and landing
* 1.6 Telecommunications
* 1.7 Electrical power
* 1.8 Temperature control and protection from the environment
* 1.9 Propulsion
* 1.9.1 Monopropellant
* 1.9.2 Bipropellant
* 1.9.3 Ion
* 1.10 Mechanical devices
* 1.11 Robotic vs. uncrewed spacecraft
* 2 Control
* 3 Space probes
* 4 SpaceX Dragon
* 5 Robotic spacecraft service vehicles
* 6 See also
* 7 References
* 8 External links

## History

A replica of Sputnik 1 at the U.S. National Air and Space Museum A replica of Explorer 1

The first robotic spacecraft was launched by the Soviet Union (USSR) on 22 July 1951, a suborbital flight carrying two dogs Dezik and Tsygan.[1] Four other such flights were made through the fall of 1951.

The first artificial satellite, Sputnik 1, was put into a 215-by-939-kilometer (116 by 507 nmi) Earth orbit by the USSR on 4 October 1957. On 3 November 1957, the USSR orbited Sputnik 2. Weighing 113 kilograms (249 lb), Sputnik 2 carried the first living animal into orbit, the dog Laika.[2] Since the satellite was not designed to detach from its launch vehicle's upper stage, the total mass in orbit was 508.3 kilograms (1,121 lb).[3]

In a close race with the Soviets, the United States launched its first artificial satellite, Explorer 1, into a 357-by-2,543-kilometre (193 by 1,373 nmi) orbit on 31 January 1958. Explorer I was an 205-centimetre (80.75 in) long by 15.2-centimetre (6.00 in) diameter cylinder weighing 14.0 kilograms (30.8 lb), compared to Sputnik 1, a 58-centimeter (23 in) sphere which weighed 83.6 kilograms (184 lb). Explorer 1 carried sensors which confirmed the existence of the Van Allen belts, a major scientific discovery at the time, while Sputnik 1 carried no scientific sensors. On 17 March 1958, the US orbited its second satellite, Vanguard 1, which was about the size of a grapefruit, and remains in a 670-by-3,850-kilometre (360 by 2,080 nmi) orbit as of 2016[update].

Nine other countries have successfully launched satellites using their own launch vehicles: France (1965), Japan and China (1970), the United Kingdom (1971), India (1980), Israel (1988), Iran (2009), North Korea (2012),Cite error: Closing `</ref>` missing for `<ref>` tag

JPL divides the "flight system" of a spacecraft into subsystems.[4] These include:

### Structure

An illustration's of NASA's planned Orion spacecraft approaching a robotic asteroid capture vehicle

This is the physical backbone structure. It:

* provides overall mechanical integrity of the spacecraft
* ensures spacecraft components are supported and can withstand launch loads

### Data handling

This is sometimes referred to as the command and data subsystem. It is often responsible for:

* command sequence storage
* maintaining the spacecraft clock
* collecting and reporting spacecraft telemetry data (e.g. spacecraft health)
* collecting and reporting mission data (e.g. photographic images)

### Attitude determination and control

This system is mainly responsible for the correct spacecraft's orientation in space (attitude) despite external disturbance-gravity gradient effects, magnetic-field torques, solar radiation and aerodynamic drag; in addition it may be required to reposition movable parts, such as antennas and solar arrays.[5]

### Landing on hazardous terrain

In planetary exploration missions involving robotic spacecraft, there are three key parts in the processes of landing on the surface of the planet to ensure a safe and successful landing.[6] This process includes an entry into the planetary gravity field and atmosphere, a descent through that atmosphere towards an intended/targeted region of scientific value, and a safe landing that guarantees the integrity of the instrumentation on the craft is preserved. While the robotic spacecraft is going through those parts, it must also be capable of estimating its position compared to the surface in order to ensure reliable control of itself and its ability to maneuver well. The robotic spacecraft must also efficiently perform hazard assessment and trajectory adjustments in real time to avoid hazards. To achieve this, the robotic spacecraft requires accurate knowledge of where the spacecraft is located relative to the surface (localization), what may pose as hazards from the terrain (hazard assessment), and where the spacecraft should presently be headed (hazard avoidance). Without the capability for operations for localization, hazard assessment, and avoidance, the robotic spacecraft becomes unsafe and can easily enter dangerous situations such as surface collisions, undesirable fuel consumption levels, and/or unsafe maneuvers.

### Entry, descent, and landing

Integrated sensing incorporates an image transformation algorithm to interpret the immediate imagery land data, perform a real-time detection and avoidance of terrain hazards that may impede safe landing, and increase the accuracy of landing at a desired site of interest using landmark localization techniques. Integrated sensing completes these tasks by relying on pre-recorded information and cameras to understand its location and determine its position and whether it is correct or needs to make any corrections (localization). The cameras are also used to detect any possible hazards whether it is increased fuel consumption or it is a physical hazard such as a poor landing spot in a crater or cliff side that would make landing very not ideal (hazard assessment).

### Telecommunications

Components in the telecommunications subsystem include radio antennas, transmitters and receivers. These may be used to communicate with ground stations on Earth, or with other spacecraft.[7]

### Electrical power

The supply of electric power on spacecraft generally come from photovoltaic (solar) cells or from a radioisotope thermoelectric generator. Other components of the subsystem include batteries for storing power and distribution circuitry that connects components to the power sources.[8]

### Temperature control and protection from the environment

Main article: Engineering:Spacecraft thermal control

Spacecraft are often protected from temperature fluctuations with insulation. Some spacecraft use mirrors and sunshades for additional protection from solar heating. They also often need shielding from micrometeoroids and orbital debris.[9]

### Propulsion

Spacecraft propulsion is a method that allows a spacecraft to travel through space by generating thrust to push it forward.[10] However, there is not one universally used propulsion system: monopropellant, bipropellant, ion propulsion, etc. Each propulsion system generates thrust in slightly different ways with each system having its own advantages and disadvantages. But, most spacecraft propulsion today is based on rocket engines. The general idea behind rocket engines is that when an oxidizer meets the fuel source, there is explosive release of energy and heat at high speeds, which propels the spacecraft forward. This happens due to one basic principle known as Newton's Third Law. According to Newton, "to every action there is an equal and opposite reaction." As the energy and heat is being released from the back of the spacecraft, gas particles are being pushed around to allow the spacecraft to propel forward. The main reason behind the usage of rocket engine today is because rockets are the most powerful form of propulsion there is.

#### Monopropellant

For a propulsion system to work, there is usually an oxidizer line and a fuel line. This way, the spacecraft propulsion is controlled. But in a monopropellant propulsion, there is no need for an oxidizer line and only requires the fuel line.[11] This works due to the oxidizer being chemically bonded into the fuel molecule itself. But for the propulsion system to be controlled, the combustion of the fuel can only occur due to a presence of a catalyst. This is quite advantageous due to making the rocket engine lighter and cheaper, easy to control, and more reliable. But, the downfall is that the chemical is very dangerous to manufacture, store, and transport.

#### Bipropellant

A bipropellant propulsion system is a rocket engine that uses a liquid propellent.[12] This means both the oxidizer and fuel line are in liquid states. This system is unique because it requires no ignition system, the two liquids would spontaneously combust as soon as they come into contact with each other and produces the propulsion to push the spacecraft forward. The main benefit for having this technology is because that these kinds of liquids have relatively high density, which allows the volume of the propellent tank to be small, therefore increasing space efficacy. The downside is the same as that of monopropellant propulsion system: very dangerous to manufacture, store, and transport.

#### Ion

An ion propulsion system is a type of engine that generates thrust by the means of electron bombardment or the acceleration of ions.[13] By shooting high-energy electrons to a propellant atom (neutrally charge), it removes electrons from the propellant atom and this results the propellant atom becoming a positively charged atom. The positively charged ions are guided to pass through positively charged grids that contains thousands of precise aligned holes are running at high voltages. Then, the aligned positively charged ions accelerates through a negative charged accelerator grid that further increases the speed of the ions up to 40 kilometres per second (90,000 mph). The momentum of these positively charged ions provides the thrust to propel the spacecraft forward. The advantage of having this kind of propulsion is that it is incredibly efficient in maintaining constant velocity, which is needed for deep-space travel. However, the amount of thrust produced is extremely low and that it needs a lot of electrical power to operate.

### Mechanical devices

Mechanical components often need to be moved for deployment after launch or prior to landing. In addition to the use of motors, many one-time movements are controlled by pyrotechnic devices.[14]

### Robotic vs. uncrewed spacecraft

Robotic spacecraft are specifically designed system for a specific hostile environment.[15] Due to their specification for a particular environment, it varies greatly in complexity and capabilities. While an uncrewed spacecraft is a spacecraft without personnel or crew and is operated by automatic (proceeds with an action without human intervention) or remote control (with human intervention). The term 'uncrewed spacecraft' does not imply that the spacecraft is robotic.

## Control

Robotic spacecraft use telemetry to radio back to Earth acquired data and vehicle status information. Although generally referred to as "remotely controlled" or "telerobotic", the earliest orbital spacecraft – such as Sputnik 1 and Explorer 1 – did not receive control signals from Earth. Soon after these first spacecraft, command systems were developed to allow remote control from the ground. Increased autonomy is important for distant probes where the light travel time prevents rapid decision and control from Earth. Newer probes such as Cassini–Huygens and the Mars Exploration Rovers are highly autonomous and use on-board computers to operate independently for extended periods of time.[16][17]

## Space probes

Main article: Engineering:Space probe

A space probe is a robotic spacecraft that does not orbit Earth, but instead, explores further into outer space.[1] A space probe may approach the Moon; travel through interplanetary space; flyby, orbit, or land on other planetary bodies; or enter interstellar space.

## SpaceX Dragon

Main article: Engineering:SpaceX Dragon

An example of a fully robotic spacecraft in the modern world would be SpaceX Dragon.[18] The SpaceX Dragon was a robotic spacecraft designed to send 6,000 kg (13,000 lb) of cargo to the International Space Station. The SpaceX Dragon's total height was 7.2 m (24 ft) with a diameter of 3.7 m (12 ft). The maximum launch payload mass was 6,000 kg (13,000 lb) with a maximum return mass of 3,000 kg (6,600 lb), along with a maximum launch payload volume of 25 m3 (880 cu ft) and a maximum return payload volume of 11 m3 (390 cu ft). The maximum endurance of the Dragon in space was two years.

In 2012 the SpaceX Dragon made history by becoming the first commercial robotic spacecraft to deliver cargo to the International Space Station and to safely return cargo to Earth in the same trip, something previously achieved only by governments. Since then, it performed 22 cargo flights, and its last flight was SpaceX CRS-20. The Dragon spacecraft is being replaced by the cargo variant of SpaceX Dragon 2 as of 2020.

## Robotic spacecraft service vehicles

AERCam Sprint released from the Space Shuttle Columbia payload bay

* MDA Space Infrastructure Servicing vehicle — an in-space refueling depot and service spacecraft for communication satellites in geosynchronous orbit. Launch planned for 2015.Cite error: Closing `</ref>` missing for `<ref>` tag
* OSAM-1 is NASA's Servicing, Assembly and Manufacturing engineering test mission. The vehicle has two robotic payloads with a total of three robot arms and performs multiple tasks: refueling an older Earth Observation satellite (Landsat 7), constructing a communications antenna from segments, and manufacturing a structural beam.

## See also

* Astrobotic Technology
* Geosynchronous satellite
* Human spaceflight
* Space observatory
* Timeline of Solar System exploration
* Automated cargo spacecraft

## References

1. ↑ Asif Siddiqi, Sputnik and the Soviet Space Challenge, University Press of Florida, 2003, ISBN 081302627X, p. 96
2. ↑ Whitehouse, David (2002-10-28). "First dog in space died within hours". BBC News World Edition. http://news.bbc.co.uk/. "The animal, launched on a one-way trip on board Sputnik 2 in November 1957, was said to have died painlessly in orbit about a week after blast-off. Now, it has been revealed she died from overheating and panic just a few hours after the mission started."
3. ↑ "Sputnik 2, Russian Space Web". 3 November 2012. http://www.russianspaceweb.com/sputnik2_decision.html.
4. ↑ "Chapter 11. Typical Onboard Systems". JPL. http://www2.jpl.nasa.gov/basics/bsf11-1.html.
5. ↑ Wiley J. Larson; James R. Wertz(1999). Space Mission Analysis and Design, 3rd edition. Microcosm. pp. 354. ISBN 978-1-881883-10-4,
6. ↑ Howard, Ayanna (January 2011). "Rethinking public–private space travel". Space Policy 29 (4): 266–271. doi:10.1016/j.spacepol.2013.08.002. Bibcode: 2013SpPol..29..266A.
7. ↑ LU. K. KHODAREV (1979). "Space Communications". The Great Soviet Encyclopedia. http://encyclopedia2.thefreedictionary.com/. "The transmission of information between the earth and spacecraft, between two or more points on the earth via spacecraft or using artificial means located in space (a belt of needles, a cloud of ionized particles, and so on), and between two or more spacecraft."
8. ↑ Wiley J. Larson; James R. Wertz(1999). Space Mission Analysis and Design, 3rd edition. Microcosm. pp. 409. ISBN 978-1-881883-10-4,
9. ↑ "Micrometeoroid and Orbital Debris (MMOD) Protection". NASA. http://www.nasa.gov/externalflash/ISSRG/pdfs/mmod.pdf.
10. ↑ Hall, Nancy (May 5, 2015). "Welcome to the Beginner's Guide to Propulsion". https://www.grc.nasa.gov/www/k-12/airplane/bgp.html.
11. ↑ Zhang, Bin (October 2014). "A verification framework with application to a propulsion system". Expert Systems with Applications 41 (13): 5669–5679. doi:10.1016/j.eswa.2014.03.017.
12. ↑ Chen, Yang (April 2017). "Dynamic modeling and simulation of an integral bipropellant propulsion double-valve combined test system". Acta Astronautica 133: 346–374. doi:10.1016/j.actaastro.2016.10.010. Bibcode: 2017AcAau.133..346C. https://qmro.qmul.ac.uk/xmlui/bitstream/123456789/18463/1/Wang Dynamic modeling and simulation 2016 Accepted.pdf.
13. ↑ Patterson, Michael (August 2017). "Ion Propulsion". https://www.nasa.gov/centers/glenn/about/fs21grc.html.
14. ↑ Wiley J. Larson; James R. Wertz(1999). Space Mission Analysis and Design, 3rd edition. Microcosm. pp. 460. ISBN 978-1-881883-10-4,
15. ↑ Davis, Phillips. "Basics of Space Flight". https://solarsystem.nasa.gov/basics/chapter9-1/.
16. ↑ K. Schilling; W. Flury (1989-04-11). "AUTONOMY AND ON-BOARD MISSION MANAGEMENT ASPECTS FOR THE CASSINI-TITAN PROBE" (PDF). ATHENA MARS EXPLORATION ROVERS. http://www7.informatik.uni-wuerzburg.de/. "Current space missions exhibit a rapid growth in the requirements for on-board autonomy. This is the result of increases in mission complexity, intensity of mission activity and mission duration. In addition, for interplanetary spacecraft, the operations are characterized by complicated ground control access, due to the large distances and the relevant solar system environment[…] To handle these problemsn, the spacecraft design has to include some form of autonomous control capability."
17. ↑ "Frequently Asked Questions (Athena for kids): Q) Is the rover controlled by itself or controlled by scientists on Earth?". ATHENA MARS EXPLORATION ROVERS. 2005. http://www.nasa.gov/externalflash/ISSRG/pdfs/mmod.pdf. "Communication with Earth is only twice per sol (martian day) so the rover is on its own (autonomous) for much of its journey across the martian landscape. Scientists send commands to the rover in a morning "uplink" and gather data in an afternoon "downlink." During an uplink, the rover is told where to go, but not exactly how to get there. Instead, the command contains the coordinates of waypoints toward a desired destination. The rover must navigate from waypoint to waypoint without human help. The rover has to use its "brain" and its "eyes" for these instances. The "brain" of each rover is the onboard computer software that tells the rover how to navigate based on what the Hazcams (hazard avoidance cameras) see. It is programmed with a given set of responses to a given set of circumstances. This is called "autonomy and hazard avoidance.""
18. ↑ Anderson, Chad (November 2013). "Rethinking public–private space travel". Space Policy 29 (4): 266–271. doi:10.1016/j.spacepol.2013.08.002. Bibcode: 2013SpPol..29..266A.

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* Spektr-R (2011–2019)

|

Active|

* Bion-M
* Elektro–L
* ExoMars (joint)
* Meteor-M
* Resurs-P
* Spektr-RG

In development|

* Luna-Glob
* Luna 25
* Luna 26
* Luna 27
* Luna 28
* Rosalind Franklin rover
* Spektr-UV

Communications|

* Luch (satellite)
* Soviet Deep Space Network

Concepts|

* Baikal-Angara
* Laplace-P
* Mars-Grunt
* Mercury-P
* OPSEK
* Spektr-M
* Venera-D

Images and artwork|

* Mission patches

Related|

* Cosmonaut ranks and positions
* Pilot-Cosmonaut of the Russian Federation
* Soviet space exploration history on Soviet stamps
* Cosmonauts Alley
* Monument to the Conquerors of Space
* Memorial Museum of Cosmonautics
* Soviet space dogs
* Laika
* Ivan Ivanovich

* See also: Space industry of Russia
* Russian Aerospace Defence Forces

* v
* t
* e

Solar System

* Sun
* Mercury
* Venus
* Earth
* Mars
* Ceres
* Jupiter
* Saturn
* Uranus
* Neptune
* Pluto
* Haumea
* Makemake
* Eris

| Planets|

* Terrestrial planets
* Mercury
* Venus
* Earth
* Mars

* Giant planets
* Jupiter
* Saturn
* Uranus
* Neptune

* Dwarf planets
* Ceres
* Pluto
* Haumea
* Makemake
* Eris

|

Rings|

* Jovian
* Saturnian (Rhean)
* Charikloan
* Chironean
* Uranian
* Neptunian
* Haumean

Moons|

* Terrestrial
* Moon
* other near-Earth objects
* Martian
* Phobos
* Deimos
* Jovian
* Ganymede
* Callisto
* Io
* Europa
* all 79
* Saturnian
* Titan
* Rhea
* Iapetus
* Dione
* Tethys
* Enceladus
* Mimas
* Hyperion
* Phoebe
* all 82
* Uranian
* Titania
* Oberon
* Umbriel
* Ariel
* Miranda
* all 27
* Neptunian
* Triton
* Proteus
* Nereid
* all 14
* Plutonian
* Charon
* Nix
* Hydra
* Kerberos
* Styx
* Eridian
* Dysnomia
* Haumean
* Hiʻiaka
* Namaka
* Makemakean
* S/2015 (136472) 1

Exploration
(outline)|

* Colonization
* Discovery
* astronomy
* historical models
* timeline
* Human spaceflight
* space stations
* list
* Space probes
* timeline
* list

* Mercury
* Venus
* Moon
* mining
* Mars
* Ceres
* Asteroids
* mining
* Comets
* Jupiter
* Saturn
* Uranus
* Neptune
* Pluto
* Deep space

Hypothetical
objects|

* Fifth giant
* Nemesis
* Phaeton
* Planet Nine
* Planet V
* Planet X
* Theia
* Tyche
* Vulcan
* Vulcanoids
* Subsatellites

Lists|

* Comets
* Dwarf planets (possible)
* Gravitationally rounded objects
* Minor planets
* names
* Natural satellites
* Solar System models
* Solar System objects
* by size
* by discovery date

| Small Solar
System bodies|

* Comets
* Damocloids
* Meteoroids
* Minor planets
* moons
* Planetesimal

* Mercury-crossers
* Venus-crossers
* Venus trojans
* Near-Earth objects
* Earth-crossers
* Earth trojans
* Mars-crossers
* Mars trojans

* Asteroid belt
* Asteroids
* Ceres
* Pallas
* Juno
* Vesta
* first 1000
* families
* exceptional
* Kirkwood gap
* Main-belt comets

* Jupiter-crossers
* Jupiter trojans
* Centaurs
* Saturn-crossers
* Uranus-crossers
* Uranus trojans
* Neptune-crossers
* Neptune trojans
* Cis-Neptunian objects
* Trans-Neptunian objects

* Plutoids
* Kuiper belt
* Cubewanos
* Plutinos
* Detached objects
* Hills cloud
* Oort cloud
* Scattered disc
* Sednoids

|

Formation
and evolution|

* Accretion
* Accretion disk
* Asteroid belt
* Circumplanetary disk
* Circumstellar disc
* Circumstellar envelope
* Cosmic dust
* Debris disk
* Detached object
* Disrupted planet
* Excretion disk
* Exoplanetary Circumstellar Environments and Disk Explorer
* Exozodiacal dust
* Extraterrestrial materials
* Extraterrestrial sample curation
* Giant-impact hypothesis
* Gravitational collapse
* Hills cloud
* Interplanetary dust cloud
* Interplanetary medium
* Interplanetary space
* Interstellar cloud
* Interstellar dust
* Interstellar medium
* Interstellar space
* Kuiper belt
* List of interstellar and circumstellar molecules
* Merging stars
* Molecular cloud
* Nebular hypothesis
* Oort cloud
* Outer space
* Planetary migration
* Planetary system
* Planetesimal
* Planet formation
* Protoplanetary disk
* Ring system
* Rubble pile
* Sample-return mission
* Scattered disc
* Star formation

* Outline of the Solar System
*   *   *

Solar System → Local Interstellar Cloud → Local Bubble → Gould Belt → Orion Arm → Milky Way → Milky Way subgroup → Local Group → Local Sheet → Virgo Supercluster → Laniakea Supercluster → Observable universe → Universe
Each arrow (→) may be read as "within" or "part of".

* v
* t
* e

Mobile robots and unmanned vehicles

Aerial|

* Unmanned aerial vehicle (UAV)
* Aerobot
* Helicam
* List of unmanned aerial vehicle applications
* Unmanned combat air vehicle (UCAV)
* Ornithopter

Ground|

| Walking|

* Humanoid
* Android
* Hexapod
* list

|

Other|

* Unmanned ground vehicle (UGV)
* Automated guided vehicle (AGV)
* Self-driving car
* Automatic train operation (ATO)
* list

Underwater|

* Unmanned underwater vehicle (UUV)
* Autonomous underwater vehicle (AUV)
* Intervention AUV (I-AUV)
* Remotely operated underwater vehicle (ROUV)
* Underwater glider

Surface|

* Unmanned surface vehicle (USV)

Space|

* Uncrewed spacecraft
* Robotic spacecraft
* list
* Robotic telescope
* Space probe
* Cargo spacecraft
* spaceflights to the ISS

Other|

* Domestic
* Military
* Rescue
* Medical
* Disability
* Agricultural
* BEAM robotics
* Microbotics
* Nanorobotics
* Robotics
* Robot locomotion
* Autonomous robot
* Autonomous logistics
* Radio-controlled model
* Remote control vehicle
* Remote control animal

* Categories
* Radio control
* Unmanned vehicles

* v
* t
* e

Robotics

Main articles|

* Outline
* Glossary
* Index
* History
* Geography
* Hall of Fame
* Ethics
* Laws
* Competitions
* AI competitions

Types|

* Anthropomorphic
* Humanoid
* Android
* Cyborg
* Claytronics
* Companion
* Animatronic
* Audio-Animatronics
* Industrial
* Articulated
* arm
* Domestic
* Educational
* Entertainment
* Juggling
* Military
* Medical
* Service
* Disability
* Agricultural
* Food service
* Retail
* BEAM robotics
* Soft robotics

Classifications|

* Biorobotics
* Unmanned vehicle
* aerial
* ground
* Mobile robot
* Microbotics
* Nanorobotics
* Robotic spacecraft
* Space probe
* Swarm
* Underwater
* remotely-operated

Locomotion|

* Tracks
* Walking
* Hexapod
* Climbing
* Electric unicycle
* Robot navigation

Research|

* Evolutionary
* Kits
* Simulator
* Suite
* Open-source
* Software
* Adaptable
* Developmental
* Paradigms
* Ubiquitous

Related|

* Technological unemployment
* Fictional robots

* Category
* Outline

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