Difference between revisions of "Space station" - New World Encyclopedia
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[[Image:ISS after STS-117 in June 2007.jpg|thumb|right|300px|The [[International Space Station]] in 2007]] | [[Image:ISS after STS-117 in June 2007.jpg|thumb|right|300px|The [[International Space Station]] in 2007]] | ||
| − | A '''space station''' is an artificial structure designed for [[human]]s to live in [[outer space]]. So far only [[low earth orbit]] (LEO) stations | + | A '''space station''' is an artificial structure designed for [[human]]s to live in [[outer space]]. So far only [[low earth orbit]] (LEO) stations have been implemented, and are also known as '''orbital stations.''' A space station is distinguished from other manned [[spacecraft]] by its lack of major [[spacecraft propulsion|propulsion]] or [[landing]] facilities—instead, other vehicles are used for transportation to and from the station. Space stations are designed for medium-term living in [[orbit]], for periods of [[week]]s, [[month]]s, or even [[year]]s. The only space station currently in use is the [[International Space Station]], which is a joint project between multiple nations. |
| − | Space stations are | + | Space stations are used to study the effects of long-term space flight on the human body, as well as to provide platforms for greater number and length of scientific studies than available on other space vehicles. Since the ill-fated flight of [[Soyuz 11]] to [[Salyut 1]], all manned spaceflight duration records have been set aboard space stations. The duration record of 437.7 days was set by [[Valeriy Polyakov]] aboard [[Mir]] from 1994 to 1995. [[As of 2006]], three astronauts have completed single missions of over a year, all aboard Mir. |
==Uses== | ==Uses== | ||
| − | Space stations have been used for both military and civilian purposes. The last military-use space station was [[Salyut 5]], which was used by the [[Almaz]] program of the [[Soviet Union]] in 1976 and 1977. | + | Space stations have been used for both military and civilian purposes. The last military-use space station was [[Salyut 5]], which was used by the [[Almaz]] program of the [[Soviet Union]] in 1976 and 1977. |
==Types of space station== | ==Types of space station== | ||
| − | === | + | ===Monolithic=== |
| − | Broadly speaking, the space stations | + | Broadly speaking, the space stations launched thus far have been of two types; the earlier stations, [[Salyut]] and [[Skylab]], have been "monolithic," intended to be constructed and launched in one piece, and then manned by a crew later. As such, they generally contained all their supplies and experimental equipment when launched, and were considered "expended," and then abandoned, when these were used up. |
| − | Starting with [[Salyut 6]] and [[Salyut 7]], | + | Starting with [[Salyut 6]] and [[Salyut 7]], this trend changed; these were built with two docking ports, which allowed a second crew to visit, bringing a new spacecraft (for technical reasons, a [[Soyuz spacecraft|Soyuz]] capsule cannot spend more than a few months in orbit, even powered down, safely) with them. This allowed for a crew to man the station continually. The presence of a second port also allowed [[Progress spacecraft|Progress]] supply vehicles to be docked to the station, meaning that fresh supplies could be brought to aid long-duration missions. This concept was expanded on Salyut 7, which "hard docked" with a [[TKS spacecraft|TKS tug]] shortly before it was abandoned; this served as a proof-of-concept for the use of modular space stations. The later Salyuts may reasonably be seen as a transition between the two groups. |
===Modular=== | ===Modular=== | ||
| − | The second group, [[Mir]] and the ISS, have been modular; a core unit was launched, and additional modules, generally with a specific role, were later added to that. | + | The second group, consisting of [[Mir]] and the ISS, have been modular; a core unit was launched, and additional modules, generally with a specific role, were later added to that. On Mir they were usually launched independently, whereas on the ISS, most are brought aboard NASA's shuttle. This method allows for greater flexibility in operation, as well as removing the need for a single, immensely powerful launch vehicle. These stations are also designed from the outset to have their supplies provided by logistical support, which allows for a longer lifetime at the cost of requiring regular support launches. |
==Habitability issues== | ==Habitability issues== | ||
| − | These stations have various issues that limit their long-term habitability, such as very low recycling rates, relatively high radiation levels and a lack of gravity. Some of these problems cause discomfort and long-term health effects. In the case of solar flares, all current habitats are protected by the Earth's magnetic field, and are below the [[Van Allen belts]]. | + | These stations have various issues that limit their long-term habitability, such as very low recycling rates, relatively high radiation levels, and a lack of gravity. Some of these problems cause discomfort and long-term health effects. In the case of solar flares, all current habitats are protected by the Earth's magnetic field, and are below the [[Van Allen belts]]. |
| − | Future [[space habitat]]s may attempt to address these issues, and are intended for long-term occupation. Some designs might even accommodate large numbers of people, essentially "[[city|cities]] in space" | + | Future [[space habitat]]s may attempt to address these issues, and are intended for long-term occupation. Some designs might even accommodate large numbers of people, essentially "[[city|cities]] in space," which people would make their homes. No such design has yet been constructed, because even for a small station, the extra equipment is too expensive to place in orbit. |
| − | Possible ways to deal with these costs would be building | + | Possible ways to deal with these costs would be building large numbers of rockets (economies of scale), reusable rockets, [[ISRU|In Situ Resource Utilization]], or the hypothetical construction of [[space elevator]]s. |
==Past and present space stations== | ==Past and present space stations== | ||
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**'''[[Salyut 4]]''' (1975-1976, 2 crews) | **'''[[Salyut 4]]''' (1975-1976, 2 crews) | ||
**'''[[Salyut 5]]/Almaz''' (1976-1977, 2 crews and 1 failed docking) | **'''[[Salyut 5]]/Almaz''' (1976-1977, 2 crews and 1 failed docking) | ||
| − | **'''[[Salyut 6]]''' (1977-1981, 16 crews (5 long duration, 11 short duration and 1 failed docking) | + | **'''[[Salyut 6]]''' (1977-1981, 16 crews (5 long duration, 11 short duration, and 1 failed docking) |
| − | **'''[[Salyut 7]]''' (1982-1986, 10 crews (6 long duration, 4 short duration and 1 failed docking) | + | **'''[[Salyut 7]]''' (1982-1986, 10 crews (6 long duration, 4 short duration, and 1 failed docking) |
*'''[[Skylab]]''' space station (USA, 1973-1974, 3 crews) | *'''[[Skylab]]''' space station (USA, 1973-1974, 3 crews) | ||
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*'''[[Mir]]''' space station (USSR/Russia, 1986-1999, [[List of Mir Expeditions|28 long duration crews]]) | *'''[[Mir]]''' space station (USSR/Russia, 1986-1999, [[List of Mir Expeditions|28 long duration crews]]) | ||
| − | *'''[[International Space Station]] (ISS)''' ( | + | *'''[[International Space Station]] (ISS)''' (U.S., Russia, Japan, European Union, Canada, 2000-ongoing, [[List of International Space Station Expeditions|14 long duration crews]] to date) |
| − | Following the controlled deorbiting of Mir in 2001, the International Space Station | + | Following the controlled deorbiting of Mir in 2001, the International Space Station became the only space station currently in orbit; it has been continuously manned since October 30, 2000. As of September 9, 2006, it was 44.5 meters (146 ft) in length along the core between the Destiny and Zvezda modules or 52 meters (171 ft) long when a [[Progress spacecraft|Progress]] is attached, and has a mass of 183.3 [[metric ton]]s (202.1 [[short ton]]s). |
===List of occupied space stations, with statistics===<!-- This section is linked from [[International Space Station]] —> | ===List of occupied space stations, with statistics===<!-- This section is linked from [[International Space Station]] —> | ||
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* **ISS stats as of October 27, 2006. | * **ISS stats as of October 27, 2006. | ||
| − | * ***ISS stats as of October 27, 2006.<sub>19 shuttles, 13 ''Soyuz'', 1 ''Soyuz - Assembly'', 22 ''Progress'', 2 ''Proton'' and ''Pirs''</sub> | + | * ***ISS stats as of October 27, 2006.<sub>19 shuttles, 13 ''Soyuz'', 1 ''Soyuz--Assembly'', 22 ''Progress'', 2 ''Proton'' and ''Pirs''</sub> |
==Canceled space stations== | ==Canceled space stations== | ||
[[Image:MOL_USAF.png|thumb|right|Gemini B reentry module separates from the MOL. 1967 conceptual drawing using Gemini reentry spacecraft. (USAF)]] | [[Image:MOL_USAF.png|thumb|right|Gemini B reentry module separates from the MOL. 1967 conceptual drawing using Gemini reentry spacecraft. (USAF)]] | ||
[[Image:Power Tower Space Station Concept.jpg|thumb|right|Space Station Freedom Concept (1984)]] | [[Image:Power Tower Space Station Concept.jpg|thumb|right|Space Station Freedom Concept (1984)]] | ||
| − | *A second Skylab unit (''[[Skylab B]]'') was manufactured, as a backup article; due to the high costs of providing launch vehicles, and a desire by NASA to cease Saturn and Apollo operations in time to prepare for the [[Space Shuttle]] coming into service, it was never flown. The hull can now be seen in the [[National Air and Space Museum]], in Washington DC, where it is a popular tourist attraction. A number of additional Salyuts were also produced, as backups or as flight articles that were later canceled. | + | *A second Skylab unit (''[[Skylab B]]'') was manufactured, as a backup article; due to the high costs of providing launch vehicles, and a desire by NASA to cease Saturn and Apollo operations in time to prepare for the [[Space Shuttle]] coming into service, it was never flown. The hull can now be seen in the [[National Air and Space Museum]], in Washington DC, where it is a popular tourist attraction. A number of additional ''Salyuts'' were also produced, as backups or as flight articles that were later canceled. |
| − | *The U.S. ''[[Space Station Freedom]]'' program, which - despite being under development for ten years - was never launched, evolved into the International Space Station, incorporating elements of the also canceled Russian ''[[Mir-2]]'' station, which was never constructed. | + | *The U.S. ''[[Space Station Freedom]]'' program, which--despite being under development for ten years--was never launched, evolved into the International Space Station, incorporating elements of the also canceled Russian ''[[Mir-2]]'' station, which was never constructed. |
| − | *Other canceled space station programs included the [[United States Air Force]] ''[[Manned Orbiting Laboratory]]'' project, canceled in 1969 about a year before the first planned test flight; this was unusual in being an explicitly military project, as opposed to the Soviet [[Almaz]] program, which was heavily intertwined with - and concealed by - the contemporaneous Salyut program. | + | *Other canceled space station programs included the [[United States Air Force]] ''[[Manned Orbiting Laboratory]]'' project, canceled in 1969, about a year before the first planned test flight; this was unusual in being an explicitly military project, as opposed to the Soviet [[Almaz]] program, which was heavily intertwined with--and concealed by--the contemporaneous Salyut program. |
*The European ''Columbus'' project planned to create a small space station serviced by the [[Hermes (shuttle)|Hermes]] shuttle. It evolved into the ISS [[Columbus (ISS module)|Columbus]] module. | *The European ''Columbus'' project planned to create a small space station serviced by the [[Hermes (shuttle)|Hermes]] shuttle. It evolved into the ISS [[Columbus (ISS module)|Columbus]] module. | ||
==Future developments== | ==Future developments== | ||
| − | *Currently, [[Bigelow Aerospace]] is commercially developing inflatable habitat modules, derived from the earlier [[Transhab]] concept, intended to be used for space station construction and for a space prize they are funding and operating, [[America's Space Prize]]. [[Genesis-1]] is a ⅓-scale unmanned prototype sent up to test the feasibility of inflatable structures and other systems in space. The experimental space habitat prototype [[Genesis II (space complex module)|Genesis II]] is planned to be the second subscale pathfinder mission to test and confirm systems to be used in the private company's future full-scale manned modules. Genesis II will be Bigelow Aerospace’s first true commercial flight, carrying items and pictures provided by paying customers. | + | *Currently, [[Bigelow Aerospace]] is commercially developing inflatable habitat modules, derived from the earlier [[Transhab]] concept, intended to be used for space station construction and for a space prize they are funding and operating, [[America's Space Prize]]. *[[Genesis-1]] is a ⅓-scale unmanned prototype sent up to test the feasibility of inflatable structures and other systems in space. The experimental space habitat prototype [[Genesis II (space complex module)|Genesis II]] is planned to be the second subscale pathfinder mission to test and confirm systems to be used in the private company's future full-scale manned modules. Genesis II will be Bigelow Aerospace’s first true commercial flight, carrying items and pictures provided by paying customers. |
* The [[BA 330]] (previously known as the Nautilus space complex module) is the complete, full-scale production model of Bigelow Aerospace's expandable space habitation module program | * The [[BA 330]] (previously known as the Nautilus space complex module) is the complete, full-scale production model of Bigelow Aerospace's expandable space habitation module program | ||
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*[[Project 921-2]] is the working name given by the People's Republic of China for plans to create a manned space station by 2012. | *[[Project 921-2]] is the working name given by the People's Republic of China for plans to create a manned space station by 2012. | ||
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== References == | == References == | ||
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==External links== | ==External links== | ||
| − | *[http://digital.library.unt.edu/govdocs/crs/search.tkl?q=space+stations&search_crit=subject&search=Search&date1=Anytime&date2=Anytime&type=form Read Congressional Research Service (CRS) Reports regarding Space Stations] | + | *[http://digital.library.unt.edu/govdocs/crs/search.tkl?q=space+stations&search_crit=subject&search=Search&date1=Anytime&date2=Anytime&type=form Read Congressional Research Service (CRS) Reports regarding Space Stations]. Retrieved August 6, 2007. |
| − | *[news:sci.space.station Space Station Newsgroup - sci.space.station] | + | *[news:sci.space.station Space Station Newsgroup - sci.space.station]. Retrieved August 6, 2007. |
| − | *[http://www.infoshop.org/sf/index.php/Space_Stations_in_Science_Fiction List of Science Fiction Space Stations] | + | *[http://www.infoshop.org/sf/index.php/Space_Stations_in_Science_Fiction List of Science Fiction Space Stations]. Retrieved August 6, 2007. |
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[[Category:Physical sciences]] | [[Category:Physical sciences]] | ||
Revision as of 15:49, 6 August 2007
A space station is an artificial structure designed for humans to live in outer space. So far only low earth orbit (LEO) stations have been implemented, and are also known as orbital stations. A space station is distinguished from other manned spacecraft by its lack of major propulsion or landing facilities—instead, other vehicles are used for transportation to and from the station. Space stations are designed for medium-term living in orbit, for periods of weeks, months, or even years. The only space station currently in use is the International Space Station, which is a joint project between multiple nations.
Space stations are used to study the effects of long-term space flight on the human body, as well as to provide platforms for greater number and length of scientific studies than available on other space vehicles. Since the ill-fated flight of Soyuz 11 to Salyut 1, all manned spaceflight duration records have been set aboard space stations. The duration record of 437.7 days was set by Valeriy Polyakov aboard Mir from 1994 to 1995. As of 2006, three astronauts have completed single missions of over a year, all aboard Mir.
Uses
Space stations have been used for both military and civilian purposes. The last military-use space station was Salyut 5, which was used by the Almaz program of the Soviet Union in 1976 and 1977.
Types of space station
Monolithic
Broadly speaking, the space stations launched thus far have been of two types; the earlier stations, Salyut and Skylab, have been "monolithic," intended to be constructed and launched in one piece, and then manned by a crew later. As such, they generally contained all their supplies and experimental equipment when launched, and were considered "expended," and then abandoned, when these were used up.
Starting with Salyut 6 and Salyut 7, this trend changed; these were built with two docking ports, which allowed a second crew to visit, bringing a new spacecraft (for technical reasons, a Soyuz capsule cannot spend more than a few months in orbit, even powered down, safely) with them. This allowed for a crew to man the station continually. The presence of a second port also allowed Progress supply vehicles to be docked to the station, meaning that fresh supplies could be brought to aid long-duration missions. This concept was expanded on Salyut 7, which "hard docked" with a TKS tug shortly before it was abandoned; this served as a proof-of-concept for the use of modular space stations. The later Salyuts may reasonably be seen as a transition between the two groups.
Modular
The second group, consisting of Mir and the ISS, have been modular; a core unit was launched, and additional modules, generally with a specific role, were later added to that. On Mir they were usually launched independently, whereas on the ISS, most are brought aboard NASA's shuttle. This method allows for greater flexibility in operation, as well as removing the need for a single, immensely powerful launch vehicle. These stations are also designed from the outset to have their supplies provided by logistical support, which allows for a longer lifetime at the cost of requiring regular support launches.
Habitability issues
These stations have various issues that limit their long-term habitability, such as very low recycling rates, relatively high radiation levels, and a lack of gravity. Some of these problems cause discomfort and long-term health effects. In the case of solar flares, all current habitats are protected by the Earth's magnetic field, and are below the Van Allen belts.
Future space habitats may attempt to address these issues, and are intended for long-term occupation. Some designs might even accommodate large numbers of people, essentially "cities in space," which people would make their homes. No such design has yet been constructed, because even for a small station, the extra equipment is too expensive to place in orbit.
Possible ways to deal with these costs would be building large numbers of rockets (economies of scale), reusable rockets, In Situ Resource Utilization, or the hypothetical construction of space elevators.
Past and present space stations
(dates refer to periods when stations were inhabited by crews)
- Salyut space stations (USSR, 1971-1986)
- Salyut 1 (1971, 1 crew and 1 failed docking)
- Salyut 2/Almaz (1973, failed shortly after launch)
- Salyut 3/Almaz (1974, 1 crew and 1 failed docking)
- Salyut 4 (1975-1976, 2 crews)
- Salyut 5/Almaz (1976-1977, 2 crews and 1 failed docking)
- Salyut 6 (1977-1981, 16 crews (5 long duration, 11 short duration, and 1 failed docking)
- Salyut 7 (1982-1986, 10 crews (6 long duration, 4 short duration, and 1 failed docking)
- Skylab space station (USA, 1973-1974, 3 crews)
- Mir space station (USSR/Russia, 1986-1999, 28 long duration crews)
- International Space Station (ISS) (U.S., Russia, Japan, European Union, Canada, 2000-ongoing, 14 long duration crews to date)
Following the controlled deorbiting of Mir in 2001, the International Space Station became the only space station currently in orbit; it has been continuously manned since October 30, 2000. As of September 9, 2006, it was 44.5 meters (146 ft) in length along the core between the Destiny and Zvezda modules or 52 meters (171 ft) long when a Progress is attached, and has a mass of 183.3 metric tons (202.1 short tons).
List of occupied space stations, with statistics
| Space station | Image | Launched | Reentered | Days in use | Total crew and visitors |
Visits | Mass (kg) | ||
|---|---|---|---|---|---|---|---|---|---|
| In orbit | Occupied | Manned | Unmanned | ||||||
| Salyut 1 | 
|
Apr 19, 1971 01:40:00 UTC |
Oct 11, 1971 | 175 | 24 | 3 | 2 | 0 | 18,425 |
| Skylab | 180px | May 14, 1973 17:30:00 UTC |
Jul 11, 1979 16:37:00 UTC |
2,249 | 171 | 9 | 3 | 0 | 77,088 |
| Salyut 3 | 
|
Jun 25, 1974 22:38:00 UTC |
Jan 24, 1975 | 213 | 15 | 2 | 1 | 0 | 18,500 |
| Salyut 4 | 
|
Dec 26, 1974 04:15:00 UTC |
Feb 3, 1977 | 770 | 92 | 4 | 2 | 1 | 18,500 |
| Salyut 5 | 180px | Jun 22, 1976 18:04:00 UTC |
Aug 8, 1977 | 412 | 67 | 4 | 2 | 0 | 19,000 |
| Salyut 6 | 180px | Sep 29, 1977 06:50:00 UTC |
Jul 29, 1982 | 1,764 | 683 | 33 | 16 | 14 | 19,000 |
| Salyut 7 | 
|
Apr 19, 1982 19:45:00 UTC |
Feb 7, 1991 | 3,216 | 816 | 26 | 12 | 15 | 19,000 |
| Mir | 
|
Feb 19, 1986 21:28:23 UTC |
Mar 23, 2001 05:50:00 UTC |
5,511 | 4,594 | 137 | 39 | 68 | 124,340 |
| ISS | 
|
Nov 20, 1998 | Currently in orbit Projected 2025 |
**2,898 | **2,185 | ***153 | ***32 | ***25 | **206,040 (454,240 lb) |
Crew and visitors counting is non-distinct.
- **ISS stats as of October 27, 2006.
- ***ISS stats as of October 27, 2006.19 shuttles, 13 Soyuz, 1 Soyuz—Assembly, 22 Progress, 2 Proton and Pirs
Canceled space stations
- A second Skylab unit (Skylab B) was manufactured, as a backup article; due to the high costs of providing launch vehicles, and a desire by NASA to cease Saturn and Apollo operations in time to prepare for the Space Shuttle coming into service, it was never flown. The hull can now be seen in the National Air and Space Museum, in Washington DC, where it is a popular tourist attraction. A number of additional Salyuts were also produced, as backups or as flight articles that were later canceled.
- The U.S. Space Station Freedom program, which—despite being under development for ten years—was never launched, evolved into the International Space Station, incorporating elements of the also canceled Russian Mir-2 station, which was never constructed.
- Other canceled space station programs included the United States Air Force Manned Orbiting Laboratory project, canceled in 1969, about a year before the first planned test flight; this was unusual in being an explicitly military project, as opposed to the Soviet Almaz program, which was heavily intertwined with—and concealed by—the contemporaneous Salyut program.
- The European Columbus project planned to create a small space station serviced by the Hermes shuttle. It evolved into the ISS Columbus module.
Future developments
- Currently, Bigelow Aerospace is commercially developing inflatable habitat modules, derived from the earlier Transhab concept, intended to be used for space station construction and for a space prize they are funding and operating, America's Space Prize. *Genesis-1 is a ⅓-scale unmanned prototype sent up to test the feasibility of inflatable structures and other systems in space. The experimental space habitat prototype Genesis II is planned to be the second subscale pathfinder mission to test and confirm systems to be used in the private company's future full-scale manned modules. Genesis II will be Bigelow Aerospace’s first true commercial flight, carrying items and pictures provided by paying customers.
- The BA 330 (previously known as the Nautilus space complex module) is the complete, full-scale production model of Bigelow Aerospace's expandable space habitation module program
- Project 921-2 is the working name given by the People's Republic of China for plans to create a manned space station by 2012.
ReferencesISBN links support NWE through referral fees
External links
- Read Congressional Research Service (CRS) Reports regarding Space Stations. Retrieved August 6, 2007.
- Space Station Newsgroup - sci.space.station. Retrieved August 6, 2007.
- List of Science Fiction Space Stations. Retrieved August 6, 2007.
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