Extraterrestrial Settlement
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Extraterrestrial Settlement
Extraterrestrial settlement can be any type of permanent habitation outside of Earth, beyond its space boundary, such as: * Space settlement ** Orbital space station **Cycler **Interstellar ark ***Generation ship * Extraterrestrial surface settlement (incl. extraterrestrial underground settlement) **Moonbase ** Mars base *Extraterrestrial floating settlement ** High Altitude Venus Operational Concept (HAVOC) *Extraterrestrial submerged settlement See also *Human presence in space *Human outpost Human outposts


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{{Reflist Space habitats ...
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Extraterrestrial Habitation
Human presence in space (also anthropogenic presence in space or humanity in space) is the direct and mediated presence or telepresence of humans in outer space, and in an extended sense across space including astronomical body, astronomical bodies. Human presence in space, particularly through mediation, can take many physical forms from space debris, uncrewed spacecraft, artificial satellites, space observatories, crewed spacecraft, Space art#Art in space, art in space, to human outposts in outer space such as space stations. While human presence in space, particularly its continuation and permanence can be a goal in itself, human presence can have a range of purposes and modes from space exploration, commercial use of space to extraterrestrial settlement or even space colonization and militarisation of space. Human presence in space is realized and sustained through the advancement and application of space sciences, particularly astronautics in the form of spaceflight and s ...
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Space Settlement
A space settlement (also called a space habitat, spacestead, space city or space colony) is a settlement in outer space, sustaining more extensively habitation facilities in space than a general space station or spacecraft. Possibly including closed ecological systems, its particular purpose is permanent habitation. No space settlement has been constructed yet, but many design concepts, with varying degrees of realism, have been introduced in science-fiction or proposed for actual realization. Space settlements include orbital settlements (also called orbital habitat, orbital stead, orbital city or orbital colony) around the Earth or any other celestial body, as well as cyclers and interstellar arks, as generation ships or ''world ships''. Space settlements are a form of extraterrestrial settlements, which more broadly includes habitats built on or within a body other than Earth, such as a settlement developed from a moonbase, a Mars habitat or an asteroid. Definition A sp ...
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Orbital Space Station
A space station (or orbital station) is a spacecraft which remains in orbit and hosts humans for extended periods of time. It therefore is an artificial satellite featuring habitation facilities. The purpose of maintaining a space station varies depending on the program. Most often space stations have been research stations, but they have also served military or commercial uses, such as hosting space tourists. Space stations have been hosting the only continuous presence of humans in space. The first space station was Salyut 1 (1971), hosting the first crew, of the ill-fated Soyuz 11. Consecutively space stations have been operated since Skylab (1973) and occupied since 1987 with the Salyut successor Mir. Uninterrupted human presence in orbital space through space stations have been sustained since the operational transition from the Mir to the International Space Station (ISS), with the latter's first occupation in 2000. Currently there are two fully operational space stati ...
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Cycler
A cycler is a potential spacecraft on a closed transfer orbit that would pass close to two celestial bodies at regular intervals. Cyclers could be used for carrying heavy supplies, life support and radiation shielding. Concept A cycler encounters two or more bodies regularly by employing a free-return trajectory, this trajectory was analysed by Arthur Schwaniger in 1963 with a symmetrical orbit past the Moon and Earth. Once the orbit is established, no propulsion is required to shuttle between the two, although some minor corrections may be necessary due to small perturbations in the orbit. The use of cyclers was considered in 1969 by Walter M. Hollister, who examined the case of an Earth–Venus cycler. Hollister did not have any particular mission in mind, but posited their use for both regular communication between two planets, and for multi-planet flyby missions. Triple cycler An extension of a cycler is the triple cycler like an Earth-Venus-Mars cycler, or a Jovian syste ...
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Interstellar Ark
An interstellar ark is a conceptual starship designed for interstellar travel. Interstellar arks may be the most economically feasible method of traveling such distances. The ark has also been proposed as a potential habitat to preserve civilization and knowledge in the event of a global catastrophe. Such a ship would have to be large, requiring a large power plant. The Project Orion concept of propulsion by nuclear pulses has been proposed. The largest spacecraft design analyzed in Project Orion had a diameter and weighed approximately 8 million tons. It could be large enough to host a city of 100,000 or more people. Thrust concepts Another concern is selection of power sources and mechanisms which would remain viable for the long time spans involved in interstellar travel through the desert of space. The longest-lived space probes are the Voyager program probes, which use radioisotope thermoelectric generators having a useful lifespan of a mere 50 years. One propuls ...
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Generation Ship
A generation ship, generation starship or world ship, is a hypothetical type of interstellar ark starship that travels at sub- light speed. Since such a ship might require hundreds to thousands of years to reach nearby stars, the original occupants of a generation ship would grow old and die, leaving their descendants to continue traveling. Origins Rocket pioneer Robert H. Goddard was the first to write about long-duration interstellar journeys in his "The Ultimate Migration" (1918). In this he described the death of the Sun and the necessity of an "interstellar ark". The crew would travel for centuries in suspended animation and be awakened when they reached another star system. He proposed to use small moons or asteroids as ships, and speculated that the crew would endure psychological and genetic changes over the generations. Konstantin Tsiolkovsky, considered a father of astronautic theory, first described the need for multiple generations of passengers in his essay, ...
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Extraterrestrial Surface Settlement
A space habitat (or habitation module) in a basic sense is any facility providing shelter and fulfilling habitational purposes in outer space. It is not to be confused with an extended space settlement, an arrangement of or infrastructure for multiple habitation facilities, in the sense of a space settlement. Space stations or theoretical extraterrestrial stations, such as a moonbase or Mars habitat, include or are basic space habitats. The ISS was planned to get a now canceled dedicated Habitation Module. Space tourism is driving the development of dedicated habitats in space. Axiom Station will be a commercial space station with dedicated habitat modules for the purpose of tourism and commercial research. In particular, inflatable space habitats have been in development for decades. Based on the earlier NASA TransHab design, inflatable habitats have been developed and tested in orbit by the now inactive company Bigelow Aerospace. Definition The International Astronauti ...
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Underground City
An underground city is a series of linked subterranea (geography), subterranean spaces that may provide a defensive refuge; a place for living, working or shopping; a transit system; mausoleum, mausolea; wine or storage cellars; cisterns or drainage channels; or several of these. Underground cities may be currently active modern creations or they may be historic including ancient sites, some of which may be entirely or partially open to the public. The term may also refer to a network of tunnels that connects buildings beneath street level that may house office blocks, shopping mall, shopping centres, metro stations, theatres, and other attractions. These passages can usually be accessed through the public space of any of the buildings connecting to them, and sometimes have separate entries as well. This latter definition encompasses many modern structures, whereas the former more generally covers tunnel systems from ancient times to the present day. Underground cities are espe ...
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Moonbase
A moonbase (or lunar base) is a human outpost on or below the surface of the Moon. More than a mere site of activity or temporary camp, moonbases are extraterrestrial bases, supporting uncrewed spaceflight, robotic or crewed spaceflight, human activity, by providing surface infrastructure. List of missions to the Moon, Missions to the Moon have realized single-mission bases, (Tranquility Base being the first), as well as Moon#Human presence, some small permanent infrastructure like Lunar Laser Ranging Experiment, lunar laser ranging installations. Plans for establishing moonbases, with surface or sub-surface research stations, have been proposed and are actively pursued nationally and increasingly internationally. As of 2024, the two most advanced projects to set up moonbases have been pursued Multilateralism, multilaterally as part of the United States, US-led Artemis program, with its planned Artemis program#Shelter building construction, Artemis Base Camp and as the China-led ...
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Mars Base
A Mars habitat is a hypothetical place where humans could live on Mars. Mars habitats would have to contend with surface conditions that include almost no oxygen in the air, extreme cold, low pressure, and high radiation. Alternatively, the habitat might be placed underground, which helps solve some problems but creates new difficulties. One challenge is the extreme cost of transporting building materials to the Martian surface, which by the 2010s was estimated to be about US$2 million per brick. While the gravity on Mars is lower than that on Earth, there are stronger solar radiation and temperature cycles, and high internal forces needed for pressurized habitats to contain air. To contend with these constraints, architects have worked to understand the right balance between in-situ materials and construction, and ex-situ to Mars. For example, one idea is to use the locally available regolith to shield against radiation exposure, and another idea is to use transparent ice to al ...
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