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International Space Station programme

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International Space Station programme
Insignia with flags of the original signatory states.
Program overview
Organisation
Manager
StatusActive
Programme history
Cost$150 billion (2010)
Duration1993–present[2]
First flightZarya
November 20, 1998
First crewed flightSTS-88
December 4, 1998
Launch site(s)
Vehicle information
Uncrewed vehicle(s)
Crewed vehicle(s)
Crew capacity
  • ISS: 7
  • Soyuz: 3
  • Crew Dragon: 4
  • Boeing Starliner: 4
Launch vehicle(s)
Part of a series on the
United States space program
Human spaceflight programs
Robotic spaceflight programs
NASA Astronaut Corps
Spaceports
Space launch vehicles
National security space
Civil space
Commercial space industry

The International Space Station programme is tied together by a complex set of legal, political and financial agreements between the fifteen nations involved in the project, governing ownership of the various components, rights to crewing and utilisation, and responsibilities for crew rotation and resupply of the International Space Station. It was conceived in September 1993 by the United States and Russia after 1980s plans for separate American (Freedom) and Soviet (Mir-2) space stations failed due to budgetary reasons.[2] These agreements tie together the five space agencies and their respective International Space Station programmes and govern how they interact with each other on a daily basis to maintain station operations, from traffic control of spacecraft to and from the station, to utilisation of space and crew time. In March 2010, the International Space Station Program Managers from each of the five partner agencies were presented with Aviation Week's Laureate Award in the Space category,[3] and the ISS programme was awarded the 2009 Collier Trophy.

Conception

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As the space race drew to a close in the early 1970s, the US and USSR began to contemplate a variety of potential collaborations in outer space. This culminated in the 1975 Apollo-Soyuz Test Project, the first docking of spacecraft from two different spacefaring nations. The ASTP was considered a success, and further joint missions were also contemplated.

One such concept was International Skylab, which proposed launching the backup Skylab B space station for a mission that would see multiple visits by both Apollo and Soyuz crew vehicles.[4] More ambitious was the Skylab-Salyut Space Laboratory, which proposed docking the Skylab B to a Soviet Salyut space station. Falling budgets and rising Cold War tensions in the late 1970s saw these concepts fall by the wayside, along with another plan to have the Space Shuttle dock with a Salyut space station.[5]

In the early 1980s, NASA planned to launch a modular space station called Freedom as a counterpart to the Salyut and Mir space stations. In 1984 the ESA was invited to participate in Space Station Freedom, and the ESA approved the Columbus laboratory by 1987.[6] The Japanese Experiment Module (JEM), or Kibō, was announced in 1985, as part of the Freedom space station in response to a NASA request in 1982.

In early 1985, science ministers from the European Space Agency (ESA) countries approved the Columbus programme, the most ambitious effort in space undertaken by that organization at the time. The plan spearheaded by Germany and Italy included a module which would be attached to Freedom, and with the capability to evolve into a full-fledged European orbital outpost before the end of the century.[7]

Increasing costs threw these plans into doubt in the early 1990s. Congress was unwilling to provide enough money to build and operate Freedom, and demanded NASA increase international participation to defray the rising costs or they would cancel the entire project outright.[8]

Simultaneously, the USSR was conducting planning for the Mir-2 space station, and had begun constructing modules for the new station by the mid-1980s. However the collapse of the Soviet Union required these plans to be greatly downscaled, and soon Mir-2 was in danger of never being launched at all.[9] With both space station projects in jeopardy, American and Russian officials met and proposed they be combined. [10]

In September 1993, American Vice-President Al Gore and Russian Prime Minister Viktor Chernomyrdin announced plans for a new space station, which eventually became the International Space Station.[11] They also agreed, in preparation for this new project, that the United States would be involved in the Mir programme, including American Shuttles docking, in the Shuttle–Mir programme.[12]

1998 agreement

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A commemorative plaque honouring Space Station Intergovernmental Agreement signed on January 29, 1998

The legal structure that regulates the station is multi-layered. The primary layer establishing obligations and rights between the ISS partners is the Space Station Intergovernmental Agreement (IGA), an international treaty signed on January 28, 1998 by fifteen governments involved in the space station project. The ISS consists of Canada, Japan, the Russian Federation, the United States, and eleven Member States of the European Space Agency (Belgium, Denmark, France, Germany, Italy, The Netherlands, Norway, Spain, Sweden, Switzerland and the United Kingdom).[13] Article 1 outlines its purpose:

This Agreement is a long term international co-operative framework on the basis of genuine partnership, for the detailed design, development, operation, and utilization of a permanently inhabited civil Space Station for peaceful purposes, in accordance with international law.[14]

The IGA sets the stage for a second layer of agreements between the partners referred to as 'Memoranda of Understanding' (MOUs), of which four exist between NASA and each of the four other partners. There are no MOUs between ESA, Roskosmos, CSA and JAXA because NASA is the designated manager of the ISS. The MOUs are used to describe the roles and responsibilities of the partners in more detail.

A third layer consists of bartered contractual agreements or the trading of the partners' rights and duties, including the 2005 commercial framework agreement between NASA and Roscosmos that sets forth the terms and conditions under which NASA purchases seats on Soyuz crew transporters and cargo capacity on uncrewed Progress transporters.

A fourth legal layer of agreements implements and supplements the four MOUs further. Notably among them is the ISS code of conduct made in 2000, setting out criminal jurisdiction, anti-harassment and certain other behavior rules for ISS crewmembers.[15]

Programme operations

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Expeditions

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This section is an excerpt from International Space Station § Expeditions.[edit]
Zarya and Unity were entered for the first time on 10 December 1998.
Soyuz TM-31 being prepared to bring the first resident crew to the station in October 2000
Each permanent crew is given an expedition number. Expeditions run up to six months, from launch until undocking, an 'increment' covers the same time period, but includes cargo spacecraft and all activities. Expeditions 1 to 6 consisted of three-person crews. Expeditions 7 to 12 were reduced to the safe minimum of two following the destruction of the NASA Shuttle Columbia. From Expedition 13 the crew gradually increased to six around 2010.[16][17] With the arrival of crew on US commercial vehicles beginning in 2020,[18] NASA has indicated that expedition size may be increased to seven crew members, the number for which ISS was originally designed.[19][20]

Private flights

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This section is an excerpt from International Space Station § Private flights.[edit]

Travellers who pay for their own passage into space are termed spaceflight participants by Roscosmos and NASA, and are sometimes referred to as "space tourists", a term they generally dislike.[a] As of June 2023, thirteen space tourists have visited the ISS; nine were transported to the ISS on Russian Soyuz spacecraft, and four were transported on American SpaceX Dragon 2 spacecraft. For one-tourist missions, when professional crews change over in numbers not divisible by the three seats in a Soyuz, and a short-stay crewmember is not sent, the spare seat is sold by MirCorp through Space Adventures. Space tourism was halted in 2011 when the Space Shuttle was retired and the station's crew size was reduced to six, as the partners relied on Russian transport seats for access to the station. Soyuz flight schedules increased after 2013, allowing five Soyuz flights (15 seats) with only two expeditions (12 seats) required.[28] The remaining seats were to be sold for around US$40 million each to members of the public who could pass a medical exam. ESA and NASA criticised private spaceflight at the beginning of the ISS, and NASA initially resisted training Dennis Tito, the first person to pay for his own passage to the ISS.[b]

Anousheh Ansari became the first self-funded woman to fly to the ISS as well as the first Iranian in space. Officials reported that her education and experience made her much more than a tourist, and her performance in training had been "excellent."[29] She did Russian and European studies involving medicine and microbiology during her 10-day stay. The 2009 documentary Space Tourists follows her journey to the station, where she fulfilled "an age-old dream of man: to leave our planet as a 'normal person' and travel into outer space."[30]

In 2008, spaceflight participant Richard Garriott placed a geocache aboard the ISS during his flight.[31] This is currently the only non-terrestrial geocache in existence.[32] At the same time, the Immortality Drive, an electronic record of eight digitised human DNA sequences, was placed aboard the ISS.[33]

After a 12-year hiatus, the first two wholly space tourism-dedicated private spaceflights to the ISS were undertaken. Soyuz MS-20 launched in December 2021, carrying visiting Roscosmos cosmonaut Alexander Misurkin and two Japanese space tourists under the aegis of the private company Space Adventures;[34][35] in April 2022, the company Axiom Space chartered a SpaceX Dragon 2 spacecraft and sent its own employee astronaut Michael Lopez-Alegria and three space tourists to the ISS for Axiom Mission 1,[36][37][38] followed in May 2023 by one more tourist, John Shoffner, alongside employee astronaut Peggy Whitson and two Saudi astronauts for the Axiom Mission 2.[39][40]

Fleet operations

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This section is an excerpt from International Space Station § Fleet operations.[edit]

Various crewed and uncrewed spacecraft have supported the station's activities. Flights to the ISS include 37 Space Shuttle, 89 Progress,[c] 71 Soyuz, 5 ATV, 9 HTV, 2 Boeing Starliner, 44 SpaceX Dragon[d] and 20 Cygnus missions.[41]

There are currently eight docking ports for visiting spacecraft, with four additional ports installed but not yet put into service:[42]

  1. Harmony forward (with PMA 2 & IDA 2)
  2. Harmony zenith (with PMA 3 & IDA 3)
  3. Harmony nadir (CBM port)
  4. Unity nadir (CBM port)
  5. Prichal aft[e]
  6. Prichal forward[e]
  7. Prichal nadir
  8. Prichal port[e]
  9. Prichal starboard[e]
  10. Poisk zenith
  11. Rassvet nadir
  12. Zvezda aft

Forward ports are at the front of the station according to its normal direction of travel and orientation (attitude). Aft is at the rear of the station. Nadir is Earth facing, zenith faced away from Earth. Port is to the left if pointing one's feet towards the Earth and looking in the direction of travel and starboard is to the right.

Cargo spacecraft that will perform an orbital re-boost of the station will typically dock at an aft or nadir-facing port.

Crewed

[edit]
This section is an excerpt from List of human spaceflights to the International Space Station.[edit]
As of 30 May 2023, 269 people from 21 countries had visited the space station, many of them multiple times. The United States sent 163 people, Russia sent 57, 11 were Japanese, nine were Canadian, five were Italian, four were French, four were German, two from the United Arab Emirates and Saudi Arabia and one each from Belgium, Brazil, Denmark, Israel, Kazakhstan, Malaysia, the Netherlands, South Africa, South Korea, Spain, Sweden, and the United Kingdom.[43]

Uncrewed

[edit]
This paragraph is an excerpt from Uncrewed spaceflights to the International Space Station.[edit]
Uncrewed spaceflights to the International Space Station (ISS) are made primarily to deliver cargo, however several Russian modules have also docked to the outpost following uncrewed launches. Resupply missions typically use the Russian Progress spacecraft, European Automated Transfer Vehicles, Japanese Kounotori vehicles, and the American Dragon and Cygnus spacecraft. The primary docking system for Progress spacecraft is the automated Kurs system, with the manual TORU system as a backup. ATVs also use Kurs, however they are not equipped with TORU. The other spacecraft — the Japanese HTV, the SpaceX Dragon (under CRS phase 1) and the Northrop Grumman[44] Cygnus — rendezvous with the station before being grappled using Canadarm2 and berthed at the nadir port of the Harmony or Unity module for one to two months. Progress, Cygnus and ATV can remain docked for up to six months.[45][46] Under CRS phase 2, Cargo Dragon docks autonomously at IDA-2 or 3 as the case may be. As of December 2022, Progress spacecraft have flown most of the uncrewed missions to the ISS.

Repairs

[edit]
This section is an excerpt from Maintenance of the International Space Station.[edit]
Astronaut Scott Parazynski of STS-120 conducted a 7-hour, 19-minute spacewalk to repair (essentially sew) a damaged solar panel which helps supply power to the International Space Station. NASA considered the spacewalk dangerous with potential risk of electrical shock.
Since construction started, the International Space Station programme has had to deal with several maintenance issues, unexpected problems and failures. These incidents have affected the assembly timeline, led to periods of reduced capabilities of the station and in some cases could have forced the crew to abandon the space station for safety reasons, had these problems not been resolved.

Mission control centres

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The components of the ISS are operated and monitored by their respective space agencies at mission control centres across the globe.

The two primary control centres are:

They are supported by several more specialized control centres:

A world map highlighting the locations of space centres. See adjacent text for details.
Space centres involved with the ISS programme

Politics

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This section is an excerpt from Politics of the International Space Station.[edit]
A world map highlighting Belgium, Denmark, France, Germany, Italy, Netherlands, Norway, Spain, Sweden and Switzerland in red and Brazil in pink. See adjacent text for details.
  Primary contributing nations
  Formerly contracted nations
The politics of the International Space Station have been affected by superpower rivalries, international treaties, and funding arrangements. The Cold War was an early factor, overtaken in recent years by the United States' distrust of China. The station has an international crew, with the use of their time, and that of equipment on the station, being governed by treaties between participant nations.

Usage of crew and hardware

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This section is an excerpt from Politics of the International Space Station § Usage of crew and hardware.[edit]
Four pie charts indicating how each part of the American segment of the ISS is allocated. See adjacent text for details.
Allocation of US Orbital Segment hardware usage between nations.

There is no fixed percentage of ownership for the whole space station. Rather, Article 5 of the IGA sets forth that each partner shall retain jurisdiction and control over the elements it registers and over personnel in or on the Space Station who are its nationals.[48] Therefore, for each ISS module only one partner retains sole ownership. Still, the agreements to use the space station facilities are more complex.

The station is composed of two sides: the Russian Orbital Segment (ROS) and U.S. Orbital Segment (USOS).[49]

  • Russian Orbital Segment (mostly Russian ownership, except the Zarya module)
    • Zarya: first component of the Space Station, storage, USSR/Russia-built, U.S.-funded (hence U.S.-owned)
    • Zvezda: the functional centre of the Russian portion, living quarters, Russia-owned
    • Poisk: airlock, docking, Russia-owned
    • Rassvet: storage, docking
    • Nauka: multipurpose laboratory
    • Prichal: docking, Russia-owned
    • Pirs (Deorbited)
  • U.S. Orbital Segment (mixed U.S. and international ownership)
    • Columbus laboratory: 51% for ESA, 46.7% for NASA and 2.3% for CSA.[50]
    • Kibō laboratory: Japanese module, 51% for JAXA, 46.7% for NASA and 2.3% for CSA.[51]
    • Destiny laboratory: 97.7% for NASA and 2.3% for CSA.[52]
    • Crew time, electrical power and rights to purchase supporting services (such as data upload & download and communications) are divided 76.6% for NASA, 12.8% for JAXA, 8.3% for ESA, and 2.3% for CSA.[50][51][52]

Future of the ISS

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2008 discussions

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The heads of the ISS agencies from Canada, Europe, Japan, Russia and the United States meet in Tokyo to review ISS cooperation.

Former NASA Administrator Michael D. Griffin says the International Space Station has a role to play as NASA moves forward with a new focus for the crewed space programme, which is to go out beyond Earth orbit for purposes of human exploration and scientific discovery. "The International Space Station is now a stepping stone on the way, rather than being the end of the line", Griffin said.[53] Griffin has said that station crews will not only continue to learn how to live and work in space, but also will learn how to build hardware that can survive and function for the years required to make the round-trip voyage from Earth to Mars.[53]

Despite this view, however, in an internal e-mail leaked to the press on August 18, 2008 from Griffin to NASA managers,[54][55][56] Griffin apparently communicated his belief that the current US administration had made no viable plan for US crews to participate in the ISS beyond 2011, and that the Office of Management and Budget (OMB) and Office of Science and Technology Policy (OSTP) were actually seeking its demise.[55] The e-mail appeared to suggest that Griffin believed the only reasonable solution was to extend the operation of the Space Shuttle beyond 2010, but noted that Executive Policy (i.e. the White House) was firm that there would be no extension of the Space Shuttle retirement date, and thus no US capability to launch crews into orbit until the Orion spacecraft would become operational in 2020 as part of the Constellation programme. He did not see purchase of Russian launches for NASA crews as politically viable following the 2008 South Ossetia war, and hoped the incoming Barack Obama administration would resolve the issue in 2009 by extending Space Shuttle operations beyond 2010.

A solicitation issued by NASA JSC indicates NASA's intent to purchase from Roscosmos "a minimum of 3 Soyuz seats up to a maximum of 24 seats beginning in the Spring of 2012" to provide ISS crew transportation.[57][58]

On September 7, 2008, NASA released a statement regarding the leaked email, in which Griffin said:

The leaked internal email fails to provide the contextual framework for my remarks, and my support for the administration's policies. Administration policy is to retire the shuttle in 2010 and purchase crew transport from Russia until Ares and Orion are available. The administration continues to support our request for an INKSNA exemption. Administration policy continues to be that we will take no action to preclude continued operation of the International Space Station past 2016. I strongly support these administration policies, as do OSTP and OMB.

— Michael D. Griffin[59]

On October 15, 2008, President Bush signed the NASA Authorization Act of 2008, giving NASA funding for one additional mission to "deliver science experiments to the station".[60][61][62][63] The Act allows for an additional Space Shuttle flight, STS-134, to the ISS to install the Alpha Magnetic Spectrometer, which was previously cancelled.[64]

President of the United States Barack Obama has supported the continued operation of the station, and supported the NASA Authorization Act of 2008.[64] Obama's plan for space exploration includes finishing the station and completion of the US programmes related to the Orion spacecraft.[65]

Discussions after Russian invasion of Ukraine

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On 12 April 2021, at a meeting with Russian President Vladimir Putin, then-Deputy Prime Minister Yury Borisov announced he had decided that Russia might withdraw from the ISS programme in 2025.[66][67] According to Russian authorities, the timeframe of the station's operations has expired and its condition leaves much to be desired.[66] On 26 July 2022, Borisov, who had become head of Roscosmos, submitted to Putin his plans for withdrawal from the programme after 2024.[68] However, Robyn Gatens, the NASA official in charge of space station operations, responded that NASA had not received any formal notices from Roscosmos concerning withdrawal plans.[69] On 21 September 2022, Borisov stated that Russia was "highly likely" to continue to participate in the ISS programme until 2028.[70]

End of mission

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This section is an excerpt from International Space Station § End of mission.[edit]

Originally the ISS was planned to be a 15-year mission.[71] Therefore, an end of mission had been worked on,[72] but was several times postponed due to the success and support for the operation of the station.[73] As a result, the oldest modules of the ISS have been in orbit for more than 20 years, with their reliability having decreased.[72] It has been proposed to use funds instead elsewhere, for example for a return to the Moon.[73] According to the Outer Space Treaty, the parties are legally responsible for all spacecraft or modules they launch.[74] An unmaintained station would pose an orbital and re-entry hazard.

Russia has stated that it plans to pull out of the ISS program after 2025.[75] However, Russian modules will provide orbital station-keeping until 2028.[72]

The US planned in 2009 to deorbit the ISS in 2016.[73] But on 30 September 2015, Boeing's contract with NASA as prime contractor for the ISS was extended to 30 September 2020. Part of Boeing's services under the contract related to extending the station's primary structural hardware past 2020 to the end of 2028.[76] In July 2018, the Space Frontier Act of 2018 was intended to extend operations of the ISS to 2030. This bill was unanimously approved in the Senate, but failed to pass in the U.S. House.[77][78] In September 2018, the Leading Human Spaceflight Act was introduced with the intent to extend operations of the ISS to 2030, and was confirmed in December 2018.[79][80][81] Congress later passed similar provisions in its CHIPS and Science Act, signed into law by U.S. President Joe Biden on 9 August 2022.[82][83]

If until 2031 Commercial LEO Destinations providers are not sufficient to accommodate NASA's projects, NASA is suggesting to extend ISS operations beyond 2031.[84]

New partners

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China has reportedly expressed interest in the project, especially if it would be able to work with the Russian Federal Space Agency. Due to national security concerns, the United States Congress passed a law prohibiting contact between US and Chinese space programmes.[85] As of 2019, China is not involved in the International Space Station.[86] In addition to national security concerns, United States objections include China's human rights record and issues surrounding technology transfer.[87][88] The heads of both the South Korean and Indian space agencies announced at the first plenary session of the 2009 International Astronautical Congress on 12 October that their nations intend to join the ISS programme. The talks began in 2010, and were not successful. The heads of agency also expressed support for extending ISS lifetime.[89] European countries not a part of the International Space Station programme will be allowed access to the station in a three-year trial period, ESA officials say.[90] The Indian Space Research Organisation has made it clear that it will not join the ISS and will instead build its own space station.[91]

Cost

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This section is an excerpt from International Space Station § Cost.[edit]
The ISS has been described as the most expensive single item ever constructed.[92] As of 2010, the total cost was US$150 billion. This includes NASA's budget of $58.7 billion ($89.73 billion in 2021 dollars) for the station from 1985 to 2015, Russia's $12 billion, Europe's $5 billion, Japan's $5 billion, Canada's $2 billion, and the cost of 36 shuttle flights to build the station, estimated at $1.4 billion each, or $50.4 billion in total. Assuming 20,000 person-days of use from 2000 to 2015 by two- to six-person crews, each person-day would cost $7.5 million, less than half the inflation-adjusted $19.6 million ($5.5 million before inflation) per person-day of Skylab.[93]

Public opinion

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The International Space Station has been the target of varied criticism over the years. Critics contend that the time and money spent on the ISS could be better spent on other projects—whether they be robotic spacecraft missions, space exploration, investigations of problems here on Earth, or just tax savings.[94] Some critics, like Robert L. Park, argue that very little scientific research was convincingly planned for the ISS in the first place.[95] They also argue that the primary feature of a space-based laboratory is its microgravity environment, which can usually be studied more cheaply with a "vomit comet".[96]

One of the most ambitious ISS modules to date, the Centrifuge Accommodations Module, has been cancelled due to the prohibitive costs NASA faces in simply completing the ISS. As a result, the research done on the ISS is generally limited to experiments which do not require any specialized apparatus. For example, in the first half of 2007, ISS research dealt primarily with human biological responses to being in space, covering topics like kidney stones, circadian rhythm, and the effects of cosmic rays on the nervous system.[97][98][99]

Other critics have attacked the ISS on some technical design grounds:

  1. Jeff Foust argued that the ISS requires too much maintenance, especially by risky, expensive EVAs.[100] The magazine The American Enterprise reports, for instance, that ISS astronauts "now spend 85 percent of their time on construction and maintenance" alone.[citation needed]
  2. The Astronomical Society of the Pacific has mentioned that its orbit is rather highly inclined, which makes Russian launches cheaper, but US launches more expensive.[101]

Critics[who?] also say that NASA is often casually credited with "spin-offs" (such as Velcro and portable computers) that were developed independently for other reasons.[102] NASA maintains a list of spin-offs from the construction of the ISS, as well as from work performed on the ISS.[103][104]

In response to some of these criticisms, advocates of human space exploration say that criticism of the ISS programme is short-sighted, and that crewed space research and exploration have produced billions of dollars' worth of tangible benefits to people on Earth. Jerome Schnee estimated that the indirect economic return from spin-offs of human space exploration has been many times the initial public investment.[105] A review of the claims by the Federation of American Scientists argued that NASA's rate of return from spin-offs is actually "astoundingly bad", except for aeronautics work that has led to aircraft sales.[106]

It is therefore debatable whether the ISS, as distinct from the wider space programme, is a major contributor to society. Some advocates[who?] argue that apart from its scientific value, it is an important example of international cooperation.[107] Others[who?] claim that the ISS is an asset that, if properly leveraged, could allow more economical crewed Lunar and Mars missions.[108]

Notes

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  1. ^ Privately funded travellers who have objected to the term include Dennis Tito, the first such traveller,[21] Mark Shuttleworth, founder of Ubuntu,[22] Gregory Olsen and Richard Garriott.[23][24] Canadian astronaut Bob Thirsk said the term does not seem appropriate, referring to his crewmate, Guy Laliberté, founder of Cirque du Soleil.[25] Anousheh Ansari denied being a tourist[26] and took offence at the term.[27]
  2. ^ ESA director Jörg Feustel-Büechl said in 2001 that Russia had no right to send 'amateurs' to the ISS. A 'stand-off' occurred at the Johnson Space Center between Commander Talgat Musabayev and NASA manager Robert Cabana who refused to train Dennis Tito, a member of Musabayev's crew along with Yuri Baturin. Musabayev argued that Tito had trained 700 hours in the last year and was as qualified as any NASA astronaut, and refused to allow his crew to be trained on the USOS without Tito. Cabana would not allow training to begin, and the commander returned with his crew to their hotel.
  3. ^ Including the modified DC-1, M-MIM2 and M-UM module transports
  4. ^ Includes both crewed and uncrewed missions
  5. ^ a b c d The Prichal aft, forward, port and starboard ports still have their protective covers in place and have yet to be used since the module originally docked at the station.

References

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  1. ^ Harbaugh, Jennifer (August 19, 2015). "August 19, 2015". NASA. Retrieved September 27, 2020.
  2. ^ a b Holmes, Steven A. (September 3, 1993). "US And Russians Join in new plan for Space Station". The New York Times. Archived from the original on May 26, 2015. Retrieved October 3, 2022.
  3. ^ "India space station India plans to launch space station by 2030 Space Station". October 18, 2019. Archived from the original on October 19, 2019.
  4. ^ Frieling, Thomas. "Skylab B:Unflown Missions, Lost Opportunities". Quest. 5 (4): 12–21.
  5. ^ Portree, David S. F. (March 26, 2012). "Skylab-Salyut Space Laboratory (1972)". WIRED. Archived from the original on August 10, 2023.
  6. ^ ESA – Columbus
  7. ^ "International Space Station". Astronautix.com. Archived from the original on April 9, 2002. Retrieved May 1, 2012.
  8. ^ Leary, Warren E. (June 8, 1993). "Fate of Space Station Is in Doubt As All Options Exceed Cost Goals". The New York Times. Archived from the original on May 26, 2015.
  9. ^ "Mir-2". Astronautix. Archived from the original on August 20, 2016. Retrieved February 12, 2011.
  10. ^ "U.S. Proposes Space Station Merger with Russia". The Washington Post. November 5, 1993.
  11. ^ Heivilin, Donna (June 21, 1994). "Space Station: Impact of the Expanded Russian Role on Funding and Research" (PDF). Government Accountability Office. Retrieved November 3, 2006.
  12. ^ Dismukes, Kim (April 4, 2004). "Shuttle–Mir History/Background/How "Phase 1" Started". NASA. Archived from the original on November 16, 2001. Retrieved April 12, 2007.
  13. ^ "International Space Station – International Cooperation". March 25, 2015. Retrieved January 19, 2018.
  14. ^ Farand, Andre. "Astronauts' behaviour onboard the International Space Station: regulatory framework" (PDF). International Space Station. UNESCO. Archived from the original (PDF) on September 13, 2006. Retrieved September 16, 2006.
  15. ^ "International Space Station Expeditions". NASA. April 10, 2009. Archived from the original on August 14, 2011. Retrieved April 13, 2009.
  16. ^ NASA (2008). "International Space Station". NASA. Archived from the original on September 7, 2005. Retrieved October 22, 2008.
  17. ^ "SpaceX completes emergency crew escape manoeuvre". BBC News. January 19, 2020. Archived from the original on August 11, 2023.
  18. ^ Morring, Frank (July 27, 2012). "ISS Research Hampered By Crew Availability". Aviation Week. Archived from the original on May 1, 2013. Retrieved July 30, 2012. A commercial capability would allow the station's crew to grow from six to seven by providing a four-seat vehicle for emergency departures in addition to the three-seat Russian Soyuz capsules in use today.
  19. ^ Hoversten, Paul (April 2011). "Assembly (Nearly) Complete". Air & Space. Smithsonian Institution. Archived from the original on June 7, 2023. Retrieved May 8, 2011. In fact, we're designed on the U.S. side to take four crew. The ISS design is actually for seven. We operate with six because first, we can get all our work done with six, and second, we don't have a vehicle that allows us to fly a seventh crew member. Our requirement for the new vehicles being designed is for four seats. So I don't expect us to go down in crew size. I would expect us to increase it.
  20. ^ Associated Press, 8 May 2001
  21. ^ Associated Press, The Spokesman Review, 6 January 2002, p. A4
  22. ^ Schwartz, John (October 10, 2008). "Russia Leads Way in Space Tourism With Paid Trips into Orbit". The New York Times. Archived from the original on July 22, 2016.
  23. ^ Boyle, Alan (September 13, 2005). "Space passenger Olsen to pull his own weight". NBC News. Archived from the original on August 12, 2023.
  24. ^ "Flight to space ignited dreams | St. Catharines Standard". Stcatharinesstandard.ca. Archived from the original on September 12, 2012. Retrieved May 1, 2012.
  25. ^ ""I am NOT a tourist"". European Space Agency. February 16, 2007. Archived from the original on November 26, 2023. Retrieved May 1, 2012.
  26. ^ Goudarzi, Sara (September 15, 2006). "Interview with Anousheh Ansari, the First Female Space Tourist". Space.com. Archived from the original on August 11, 2023. Retrieved May 1, 2012.
  27. ^ Harwood, William (January 12, 2011). "Resumption of Soyuz tourist flights announced". Spaceflight Now for CBS News. Archived from the original on August 10, 2023. Retrieved May 1, 2012.
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