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The International Space Station or ISS orbits the Earth.

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The International Space Station is a manned research space facility. The International Space Station is being assembled in space. The International Space Station is a joint project between five space agencies: the National Aeronautics and Space Administration (NASA, United States), the Russian Federal Space Agency (RKA, Russian Federation), the Japan Aerospace Exploration Agency (JAXA, Japan), the Canadian Space Agency (CSA, Canada) and the European Space Agency (ESA, Europe).

International Space Station.
International Space Station.

International Space Station photographed following separation from the Space Shuttle Atlantis, September 17, 2006.

ISS Patch.

International Space Station insignia.

International Space Station Statistics.
Crew: 3 As of
July 21, 2006
perigee: 352.8 km (218.7 mi) "
Apogee: 354.2 km "
Orbital period: 91.61 minutes "
Inclination: 51.64 degrees "
Orbits per day: 15.72 "
Days in orbit: 2,918 November 18, 2006
Days occupied: 2,027 "
Total orbits: 45,684 November 5, 2006
Distance traveled: ˜1,400,000,000 km June 17, 2005
Average speed: 27,685.7 km/h (17165.1 mi/h) "
Mass: 200,783 kg September 12, 2006
Width: 73 m (across solar arrays) June 20, 2006
Length: 44.5 m (along core) "
Height: 27.5 m "
Living volume: 425 m³ August 28, 2005
Air pressure: 101.3 kPa "
International Space Station.
International Space Station NASA.

International Space Station elements as of September 2006.

International Space Station Diagram.

The Brazilian Space Agency (AEB, Brazil) participates through a separate contract with NASA. The Italian Space Agency similarly has separate contracts for various activities not done in the framework of ESA's International Space Station works (where Italy also fully participates).

In many ways the International Space Station represents a merger of previously planned independent space stations: Russia's Mir 2, the U.S. Space Station Freedom and the planned European Columbus and Japanese Experiment Module.

Due to the International Space Station, there is a permanent human presence in space, as there have always been at least two people on board International Space Station since the first permanent crew entered the International Space Station on November 2, 2000. It is serviced primarily by the Soyuz, Progress spacecraft units and Space Shuttle. The International Space Station is currently still under construction with a projected completion date of 2010. At present, the station has a capacity for a crew of three. Prior to ESA astronaut Thomas Reiter joining the Expedition 13 crew in July 2006, all permanent crewmembers have come from the Russian or United States space programs. The International Space Station has however been visited by astronauts from twelve countries and was also the destination of the first four space tourists.

History of the International Space Station.

In the early 1980s, NASA planned Space Station Freedom as a counterpart to the Soviet Salyut and Mir space stations. It never left the drawing board, and with the end of the Soviet Union and the Cold War it was cancelled. The end of the space race prompted the U.S. administration officials to start negotiations with international partners Europe, Russia, Japan and Canada in the early 1990s, in order to build a truly international space station. This project was first announced in 1993 and was called Space Station Alpha. It was planned to combine the proposed space stations of all participating space agencies: NASA's Space Station Freedom, Russia's Mir-2 (the never-assembled successor to the Mir space station, the core of which is now International Space Station Zvezda) and ESA's Columbus Laboratory Module that was planned to be a stand-alone spacelab.

Throughout the 1990s, construction delays hit the project, budget projections were heavily revised and the International Space Station structure was modified frequently. The International Space Station has been, as of today, far more expensive than originally anticipated. The ESA estimates the overall cost from the start of the project in the late 1980s to the prospective end in 2016 to be in the region of €100 billion.

International Space Station 1.
International Space Station: Zarya and Node 1 in 1999.
International Space Station 2.
International Space Station: Zarya module as seen from STS-88 (NASA). STS-88 delivered the Unity module, the second module of the ISS.
International Space Station 3.
International Space Station: Columbia lifting off on its final mission.

The first section, the Zarya Functional Cargo Block, was put in orbit in November 1998 on a Russian Proton rocket. Two further pieces (the Unity Module and Zvezda service module) were added before the first crew, Expedition 1, was sent. Expedition 1 docked to the International Space Station on November 2, 2000, and consisted of U.S. Astronaut William Shepherd and two Russian cosmonauts, Yuri Gidzenko, and Sergei Krikalev.

International Space Station construction began on November 20, 1998, and is now far behind the original planned schedule for completion in 2004 or 2005. This is mainly due to the halting of all NASA Shuttle flights following the Columbia disaster in early 2003 (although there had been prior delays due partly to Shuttle problems, and partly to delays stemming from the Russian space agency's budget constraints). For the two and a half years that the NASA Space Shuttle fleet was grounded, crew rotation continued on the station through the use of the Russian Soyuz spacecraft, but construction of the International Space Station was halted and the science conducted aboard was limited due to the crew size of two.

The reappearance of the foam debris problem on the STS-114 mission in July 2005 (the same problem that doomed Columbia) again delayed the launch sequence in 2005. as of 2006, the station is only able to accommodate three permanent crew members, compared to the expected six that the completed station will be home to.

In March 2006, a meeting of the heads of the five participating space agencies accepted the new International Space Station construction schedule that plans to complete the International Space Station by 2010. A crew of six is expected to be established in 2009, after the Shuttle's next 12 construction flights following the second Return to Flight mission STS-121. Requirements for stepping up the crew size include enhanced environmental support on the ISS, a second Soyuz permanently docked on the station to function as a second 'lifeboat', more frequent Progress flights to provide double the amount of consumables, more fuel for orbit raising maneuvers, and a sufficient supply line of experimental equipment.

Building process of the International Space Station.

Space Shuttle.
Space Shuttle structural overview.

As of the beginning of 2006 many changes have been made to the originally planned ISS. Modules and other structures have been cancelled or replaced and the number of Shuttle flights to the International Space Station has been reduced from previously planned numbers. Still, the newest International Space Station Shuttle launch manifest and the current International Space Station design scheme reveal that more than 80% of the hardware planned to be part of the International Space Station in the late 90s, is still planned to be orbited to the International Space Station by its scheduled completion date in 2010.

International Space Station Soyuz.
The Pirs is one of the modules launched by a Soyuz.

Building the International Space Station requires more than 40 assembly and utilization flights. Of these flights, currently 33 are planned to be Space Shuttle flights, with 17 ISS-shuttle flights currently flown and 16 more planned between 2006 and 2010. Other assembly flights consist of modules lifted by the Russian Proton rocket or in the case of the Pirs Airlock by a Soyuz rocket.

In addition to the assembly and utilization flights, approximately 30 Progress spacecraft flights are required to provide logistics until 2010. Experimental equipment, fuel and consumables are and will be delivered by all vehicles visiting the ISS: the Shuttle, the Russian Progress, the European ATV (prospectively from May 2007 onwards) and the Japanese HTV.

When assembly is complete, the International Space Station will have a pressurized volume of approximately 1,000 cubic meters, a mass of approximately 400,000 kilograms, approximately 100 kilowatts of power output, a truss 108.4 meters long, modules 74 meters long, and a crew of six.

As of September 2006 the station consists of several modules and elements:

ElementFlightLaunch VehicleLaunch dateLength
Zarya FGB 1A/R Proton rocket 20 November 1998 12.6 4.1 19,323
Unity Node 1 2A - STS-88 Endeavour 4 December 1998 5.49 4.57 11,612
Zvezda Service Module 1R Proton rocket 12 July 2000 13.1 4.15 19,050
Z1 Truss 3A - STS-92 Discovery 11 October 2000 4.9 4.2 8,755
P6 Truss - Solar Array* 4A - STS-97 Endeavour 30 November 2000 73.2 10.7 15,900
Destiny 5A - STS-98 Atlantis 7 February 2001 8.53 4.27 14,515
Canadarm2 6A - STS-100 Endeavour 19 April 2001 17.6 0.35 4,899
Joint Airlock - Quest Airlock 7A - STS-104 Atlantis 12 July 2001 5.5 4.0 6,064
Docking Compartment - Pirs Airlock 4R Soyuz rocket 14 September 2001 4.1 2.6 3,900
S0 Truss 8A - STS-110 Atlantis 8 April 2002 13.4 4.6 13,970
Mobile Base System for Canadarm2 UF-2 - STS-111 Endeavour 5 June 2002 5.7 2.9 1,450
S1 Truss 9A - STS-112 Atlantis 7 October 2002 13.7 3.9 12,598
P1 Truss 11A - STS-113 Endeavour November 24 2002 13.7 3.9 12,598
External Stowage Platform (ESP-2) LF1 - STS-114 Discovery 26 July 2005 4.9 3.65 2,676
P3/P4 Truss - Solar Array 12A - STS-115 Atlantis 9 September 2006 73.2 10.7 15,900

*P6 Truss to be relocated to its final position, the P5 truss mounting position, on STS-120.

Structures and design of the International Space Station.

Internation Space Station mockup.
Internation Space Station mockup at Johnson space center in Houston, Texas.
International Space Station: Service Module.
Cosmonaut Sergei Krikalev inside the Zvezda Service Module, November 2000.
International Space Station mission.
The only non-International Space Station related Shuttle flight between 2006 and 2010 will be a Hubble Space Telescope servicing mission in 2008.
International Space Station Node 2.
International Space Station Node 2.
International Space Station STS-102.
March 10, 2001 - The Leonardo Multi Purpose Logistics Module rests in Discovery's payload bay during STS-102.
International Space Station Laboratory.
International Space Station Columbus Laboratory Module.
International Space Station Kibo module.
International Space Station JEM Kibo module.
International Space Station Cupola.
International Space Station Cupola.

The Space station is located in orbit around the Earth at an altitude of approximately 360 km (220 miles), a type of orbit usually termed Low Earth orbit (The actual height varies over time by several kilometres due to atmospheric drag and reboosts). It orbits Earth in a Period of about 92 minutes; by June 2005 it had completed more than 37,500 orbits since launch of the Zarya module on November 20, 1998.

The ISS, when completed, will be essentially made of a set of communicating pressurized modules connected to a truss, on which are attached four large pairs of photovoltaic modules. The pressurized modules and the truss will be perpendicular: the truss spanning from starboard to port and the habitable zone extending on the aft-forward axis. Although during the construction the station attitude may vary, when all four photovoltaic modules are in their definitive position the aft-forward axis will be parallel to the velocity vector.

Power supply for the International Space Station. Electrical system of the International Space Station

The International Space Station source for electrical power is the sun: light is converted into electricity through the use of solar panels. Before assembly flight 4A (shuttle mission STS-97, November 30, 2000) the only power source were the Russian solar panels attached to the Zarya and Zvezda modules: the Russian segment of the station uses 28 volts dc (just like the Shuttle does). In the rest of the station, electricity is provided by the solar panels attached to the truss at a voltage ranging from 130 to 180 volts dc. The power is then stabilized and distributed at 160 volts dc and then converted to the user-required 124 volts dc. Power can be shared between the two segments of the station using converters, and this feature is essential since the cancellation of the Russian Science Power Platform: the Russian segment will depend on the U.S. built solar arrays for power supply.

Using a high-voltage (130 to 160 volts) distribution line in the so-called U.S. part of the station led to smaller power lines and thus weight savings.

Life support for the International Space Station.

The International Space Station Environmental Control and Life Support System provides or controls elements such as atmospheric pressure, oxygen levels, water, and fire extinguishing, among other things.

The highest priority for the life support system is the International Space Station atmosphere, but the system also collects, processes, and stores water and waste used and produced by the crew. For example, the system recycles fluid from the sink, shower, urine, and condensation.

Assembly of the International Space Station.

A total of 10 main pressurized modules (Zarya, Zvezda, US Lab, Unity Module (also called Node 1), Node 2, Node 3, Columbus, Kibo, MLM and the RM) are currently scheduled to be part of the International Space Station by its completion date in 2010. A number of smaller pressurized sections will be adjunct to them (Soyuz spacecrafts (permanently 2 as lifeboats - 6 months rotations), Progress transporters (2 or more), the Quest and Pirs Airlocks, as well as periodically the MPLM, the ATV and the HT-V).

Pressurized modules already launched for the International Space Station.

Currently, the International Space Station consists of only four main pressurized modules; two Russian modules Zarya and Zvezda and two US modules Destiny and Node 1. Zarya was the first module launched by a Proton rocket in November 1998, followed by a shuttle mission that connected Zarya with Node 1, the first of three node modules, 2 weeks after Zarya had been launched. This bare 2-module core of the International Space Station remained unmanned for the next one and a half years, until in July 2000 the Russian module Zvezda was added, allowing a minimum crew of two astronauts or cosmonauts to be on the International Space Station permanently.

Since 2000, the only main pressurized module delivered to the International Space Station was the Destiny Laboratory Module by STS-98 in 2001. The US Lab was also the first science module delivered to the ISS, whereas Zarya provides electrical power, storage, propulsion, and guidance functions and Zvezda provides living quarters, a life support system, a communication system, electrical power distribution, a data processing system, a flight control system, and a propulsion system. Node 1's primary function is to link different modules together, however fluids, environmental control and life support systems, electrical and data systems are also routed through Node 1 to supply work and living areas of the station.

Other pressurized sections of the current configuration of the International Space Station are the Quest Airlock and the Pirs Airlock. Soyuz spacecrafts and Progress spacecrafts docked to the International Space Station also extend the pressurized volume. At least one Soyuz spacecraft has to stay docked permanently as a 'lifeboat' and is replaced every six months by a new Soyuz as part of crew rotation.

Although not permanently docked with the ISS, the Multi-Purpose Logistics Module (MPLM) forms part of the International Space Station during Shuttle missions that include the MPLM. The MPLM is attached to Node 1 and is used for resupply and logistics flights. Speculation that the last Space Shuttle flight involving an MPLM could leave one MPLM permanently docked with the Station are fueled by the MPLM's potential capacity for a long-term stay in orbit. Modifications would need to be made, including power support and checks on whether the MPLM would influence the International Space Station overall structure. As of 2006, it is not planned to integrate the MPLM permanently into the International Space Station structure.

Pressurized modules to be launched for the International Space Station.

International Space Station: Node 2 - 2007:

As of March 2006, nearly all already built pressurized modules are planned to be launched by the Space Shuttle after return to flight with STS-121 in July 2006. If the current Shuttle launch sequence is not disrupted materially, Node 2 will be launched in the second quarter of 2007 by STS-120. Node 2 was built by the Italian Space Agency, however its ownership has been already transferred to NASA as part of a bartering agreement between NASA and ESA. Node 2 will contain eight racks that provide air, electrical power, water and other systems essential to support life on the spacecraft and is scheduled to be the hub for the Columbus module and Kibo.

International Space Station: Columbus Laboratory Module - 2007.

The next Shuttle flight after Node 2 is scheduled to bring the European module Columbus to the ISS. Columbus will be the second module mainly dedicated to science on the ISS, including the Fluid Science Laboratory (FSL), the European Physiology Modules (EPM), the Biolab, the European Drawer Rack (EDR) and various storage racks.

Multipurpose Laboratory Module - 2008 for the International Space Station.

The Russian space agency has announced that the Multipurpose Laboratory Module (MLM) is scheduled to be launched by a Proton rocket in 2008. The MLM is the main Russian science module, and depending on its actual launch date the third or fourth science module to be launched to the ISS. It will be equipped with an altitude control system that can be used as a backup by the International Space Station and will be docked onto the Zarya control module side docking port. The European Robotic Arm will be launched together with MLM, mated on its surface for a later deployment in space, according to an agreement signed in October 2005 between ESA and Roskosmos.

The communications systems used by the ISS.
The communications systems used by the ISS.

Japanese Experiment Module - 2008/2009 for the International Space Station.

The Japanese Experiment Module (JEM), aka Kibo is the next pressurized module on the schedule. It consists of two pressurized sections and one exposed facility. Three Shuttle flights are needed to bring Kibo into orbit; the pressurized sections are scheduled to fly in the second half of 2008 and in the first half of 2009. Kibo will be mounted on the Node 2, on the opposite side to the Columbus module.

Russian Research Module - 2009/2010 for the International Space Station.

NASA's International Space Station schedule still includes one Russian Research Module (RM) as part of the International Space Station that may be docked to Zvezda and is rumoured to fly to the International Space Station in 2009 or 2010 on a Russian Proton rocket. Construction on this module has not yet begun, which casts doubt on its actual delivery to the ISS.

International Space Station: Node 3 and Cupola - 2010.

Node 3 is currently scheduled for the beginning of 2010 on the penultimate Shuttle flight. Like Node 2, Node 3 was built in Italy by the Italian Space Agency, but is owned by NASA. It will be used as a storage compartment; however its original purpose, to be a hub for the Habitation Module as well as the Crew Return Vehicle, is no longer relevant, as both items were cancelled in 2001. One of the curiosities of the ISS, the 'space window' Cupola is currently scheduled to be flown together with Node 3 on the last shuttle flight to the ISS. ESA has already finished construction and is storing the Cupola until its flight together with Node 3.

Unpressurized elements for the International Space Station.

There is also a large unpressurized truss system partially in place that will eventually support the prominent solar arrays.

Cancelled elements for the International Space Station.

  • Centrifuge Accommodations Module - would have been attached to Node 2.
  • Universal Docking Module - replaced by Multipurpose Laboratory Module.
  • Docking and Stowage Module - replaced by Multipurpose Laboratory Module.
  • Habitation Module -.
  • Crew Return Vehicle (CRV).
  • Interim Control Module - no need to replace Zvezda (in storage ready to launch at short notice if required).
  • International Space Station Propulsion Module - no need to replace Zvezda.
  • Science Power Platform - power will be provided to the Russian segments partly by the US solar cell platforms.

Visiting spacecraft to the International Space Station.

  • Space Shuttle - resupply vehicle, assembly and logistics flights and crew rotation.
  • Soyuz spacecraft - crew rotation and emergency evacuation, replaced every 6 months.
  • Progress spacecraft - resupply vehicle.
  • Proposed: European (ESA) Automated Transfer Vehicle (ATV) International Space Station resupply spacecraft (scheduled for Nov 2007).
  • Proposed: Japanese (JAXA) H-II Transfer Vehicle (HTV) resupply vehicle for Kibo module (scheduled for 2008).
  • Proposed: SpaceX Dragon for NASA Commercial Orbital Transportation Services (Scheduled for 2009).
  • Proposed: Rocketplane Kistler K-1 Vehicle for NASA Commercial Orbital Transportation Services.
  • Proposed: Russian Space Shuttle Kliper for possible crew rotation and as resupply transporter (scheduled for 2012).
  • Proposed: Crew Exploration Vehicle possible crew rotation and as resupply transporter (officially scheduled for 2014).
  • Proposed: Advanced Crew Transportation System Soyuz-derived European-Russian crew rotation and resupply spacecraft (scheduled for 2014).

Legal aspects and agreement of the International Space Station.

Space Station Agreement.
Cover page of the Space Station Intergovernmental Agreement signed on January 28, 1998.

The legal structure that regulates the space station is multi-layered. The primary layer establishing obligations and rights between the International Space Station 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 United States, Canada, Japan, the Russian Federation, and eleven Member States of the European Space Agency (Belgium, Denmark, France, Germany, Italy, The Netherlands, Norway, Spain, Sweden, Switzerland and the United Kingdom). 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 utilisation of a permanently inhabited civil Space Station for peaceful purposes, in accordance with international law.

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 due to the fact that 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 Roskosmos that sets forth the terms and conditions under which NASA purchases seats on Soyuz crew transporters and cargo capacity on unmanned Progress transporters.

A fourth legal layer of agreements implements and supplements the four MOUs further. Notably among them is the International Space Station code of conduct, setting out criminal jurisdiction, anti-harassment and certain other behavior rules for International Space Station crewmembers.

Utilization of the International Space Station.

Destiny lab.
The nadir window in the Destiny lab - the Destiny lab is 100% owned by NASA.
The Zarya module.
The Zarya module was built in Russia but is 100% owned by NASA.

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. Therefore, for each International Space Station module only one partner retains sole ownership. Still, the agreements to use the space station facilities are more complex.

The three planned Russian segments Zvezda, the Multipurpose Laboratory Module and the Russian Research Modules are made and owned by Russia which, as of today, also retains its current and prospective usage (Zarya, although constructed and launched by Russia, has been paid for and is officially owned by NASA). In order to use the Russian parts of the station, the partners use bilateral agreements (third and fourth layer of the above outlined legal structure). The rest of the station, (the U.S., the European and Japanese pressurized modules as well as the truss and solar panel structure and the two robotic arms) has been agreed to be utilized as follows (% refers to time that each structure may be used by each partner):

  • (1) Columbus: 51% for ESA, 49% for NASA and CSA (CSA has agreed with NASA to use 2.3% of all non-Russian International Space Station structure).
  • (2) Kibo: 51% for JAXA, 49% for NASA and CSA (2.3%).
  • (3) Destiny Lab: 100% for NASA and CSA (2.3%) as well as 100% of the truss payload accommodation.
  • (4) Crew time and power from the solar panel structure, as well as rights to purchase supporting services (upload/download and communication services) 76.6% for NASA, 12.8% for JAXA, 8.3% for ESA and 2.3% for CSA.

Costs of the International Space Station.

The most cited figure of an estimate of overall costs of the International Space Station is 100 billion (very often cited as USD; ESA, the only agency actually stating potential overall costs on its website, estimates €100 billion). Giving a precise cost estimate for the International Space Station is, however, not straightforward; it is, for instance, hard to determine which costs should actually be contributed to the International Space Station program or how the Russian contribution should be measured, as the Russian space agency runs at considerably lower USD costs than the other partners.

NASA and the International Space Station.

NASA allocates about 125 million US dollars annually to EVAs.

In contrast to common belief, the overall majority of costs for NASA are not incurred for initially building the International Space Station modules and external structure on the ground or for construction, crew and supply flights to the ISS. In fact the Space Shuttle program, which as of 2006 nearly costs $5 billion annually, is normally not considered part of the International Space Station budget, although the Shuttle has been nearly solely used for International Space Station flights since 1998.

NASA's 2007 budget request lists costs for the International Space Station (without Shuttle costs) as $25.6 billion for the years 1994 to 2005. For each of 2005 and 2006 about $1.7 to 1.8 billion are allocated to the International Space Station - this sum will be rising until 2010 when it is calculated to reach 2.3 billion and then should stay at the same level, however inflation-adjusted, until 2016, the defined end of the program.

The $1.8 billion expensed in 2005 consisted of:

  • Development of new hardware: Only $70 million were allocated to core development, for instance development of systems like navigation, data support or environmental.
  • Spacecraft Operations: $800 million consisting of $125 million for each of software, extravehicular activity systems, and logistics and maintenance. An additional $150 million is spent on flight, avionics and crew systems. The rest of $250 million goes to overall International Space Station management.
  • Launch and Mission operations: Although the Shuttle launch costs are not considered part of the International Space Station budget, mission and mission integration ($300 million), medical support ($25 million) and Shuttle launch site processing ($125 million) is within the International Space Station budget.
  • Operations Program Integration: $350 million were spent on maintaining and sustaining U.S. flight and ground hardware and software to ensure integrity of the International Space Station design and the continuous, safe operability.
  • International Space Station cargo/crew: Only $140 million were spent for purchase of supplies, cargo and crew capability for Progress and Soyuz flights.
International Space Station funding.
NASA's budget projections currently see an end to International Space Station funding in 2017 in order to free funds for the Vision for Space Exploration.

Assuming NASA's projections of average costs of $2.5 billion from 2011 to 2016 and the end of spending money on the International Space Station in 2017 (about $300-500 million) after shutdown in 2016, the overall International Space Station project costs for NASA from the announcement of the program in 1993 to its end will be about $53 billion. The 33 Shuttle flights (which, as mentioned above, are normally not considered part of the overall International Space Station costs) for the construction and supply of the International Space Station will be around $35 billion. There have also been considerable costs for designing Space Station Freedom in the 1980s and early 1990s, before the International Space Station program started in 1993. Therefore, although the actual costs contributed to the International Space Station are only half of the $100 billion figure often cited in the media, if combined with costs for the Shuttle and the design of its precursor project, it nearly reaches $100 billion for NASA alone.

ESA and the International Space Station.

ESA calculates that its contribution over the 30 year lifetime of the project will be €8 billion. The costs for the Columbus Laboratory total more than €1 billion already, costs for ATV development total several hundred million and considering that each Ariane 5 launch costs around €125 million, each ATV launch will incur considerable costs as well.

JAXA and the International Space Station.

The Kibo Laboratory has already cost $2.8 billion according to a recent 2006 article. In addition, the annual running costs for Kibo will total around $350 to 400 million.

Roskosmos and the International Space Station.

A considerable part of the Russian Space Agency's budget is used for the ISS. Since 1998 there have been over two dozen Soyuz and Progress flights, the primary crew and cargo transporters since 2003. The question, how much Russia spends on the station, measured in USD, is, however, not easy to answer. The two modules currently in orbit are derivatives of the Mir program and therefore development costs are much lower than for other modules; in addition, the exchange rate between ruble and USD is not adequately giving a real comparison to what the costs for Russia really are.

The $20 million each Space tourist has paid for an available seat on a Soyuz to the International Space Station is only offsetting a very small part of Russia's financial contribution to the ISS.

CSA and the International Space Station.

Canada, whose main contribution to the International Space Station is the Canadarm2, is estimating that through the last 20 years it has contributed about C$1.4 billion to the ISS.

Criticism of the International Space Station.

The International Space Station Centrifuge.
The International Space Station Centrifuge Accommodations Module built by JAXA for NASA, one of the most ambitious science modules, will not be part of the completed ISS.

There are many critics of the ISS, especially with regard to the biggest partner, NASA. These critics view the project as a waste of both time and American tax money, inhibiting progress on more useful projects: for instance, claiming that the very often quoted estimated US$100 billion lifetime cost could pay for dozens of unmanned scientific missions or could be used for space exploration in general or be better spent on problems on Earth.

Some critics argue that very little serious scientific research was ever convincingly planned for the ISS. They note that actual work so far has been trivial even compared to low expectations, although the International Space Station has been in orbit for eight years and manned for more than five. They point out that the scientific merit of experiments conducted on the shuttle and other space stations have been negligible compared to most other funded science in space or on the ground. Other critics suppose that the International Space Station could accommodate important research, and believe that the cancellation of ambitious science modules, such as the Centrifuge Accommodations Module, are unwarranted. They say that the planned International Space Station structure meets few of the scientific objectives of the station proposed in the 1990s.

Two technical aspects of the ISS's design have been heavily criticized:

  1. It requires too much maintenance, and in particular too much maintenance by risky, expensive EVAs;.
  2. Its orbit is too highly inclined, meaning American launches need to carry more fuel.

In general, the most economical orbits to reach are equatorial orbits reached from equatorial launch sites, due to the rotation of the Earth. The choice of the ISS's inclination arose from the political realities of the American desire to heavily involve Russia, as the Baikonur Cosmodrome in Kazakhstan is at a high latitude. Russia's involvement, in turn, saved the space station from abandonment after Columbia disintegrated in 2003.

In response to some of these criticisms, advocates of manned space exploration say that criticism of the International Space Station project is short-sighted, and that manned space research and exploration have produced billions of dollars' worth of tangible benefits to people on Earth. By some estimates, the indirect economic benefits made from commercialization of technologies developed during human space exploration have returned many times the initial investment to the economy. However, critics have argued that these estimates assume rather than conclude a good ratio of return on NASA's R&D spending; another study concluded that the NASA's rate of return from spinoffs is actually very low, except for aeronautics work that led to aircraft sales.

Critics also say that NASA is often casually credited with "spin-offs" (such as Velcro and portable computers) that were also developed independently for other reasons. NASA maintains a list of spinoffs stemming from technologies created to support construction of the ISS, as well as from work performed on the ISS. However, NASA's official list is much narrower and more arcane than the compelling narrative of billions of dollars of spinoffs.

It is therefore open to debate whether the ISS, as distinct from the wider space program, will be a major contributor to society. Some advocates have argued that apart from its scientific value (or lack thereof), it is an important example of international cooperation.

Present status of the International Space Station.

Present configuration of the ISS.
Present configuration of the ISS.

After the breakup of Columbia on February 1, 2003, and the subsequent two and a half year suspension of the U.S. Space Shuttle program, followed by problems with resuming flight operations in 2005, there was some uncertainty over the future of the International Space Station until 2006. In 2006, the international partners announced their commitment to complete the International Space Station by 2010.

Still, the future of the International Space Station depends on the Space Shuttle. Due to weight restrictions and design constraints, payloads intended for the Shuttle - even if ready to fly - cannot be launched in an economically sensible way on any other available launcher. In addition, assembly work is manpower-intensive, making it difficult to do without the assistance of EVA teams brought up by the Shuttle. Thus, if the Shuttle program suffered another disaster or a severe cut, the International Space Station project would likely be unable to continue.

Since 2003 crew exchange has been carried out using the Russian Soyuz spacecraft. Starting with Expedition 7, two-astronaut caretaker crews have been launched, instead of the previous crews of three. Because the International Space Station had not been visited by a shuttle for an extended period, a larger than planned amount of waste accumulated, temporarily hindering station operations in 2004. However Progress transports and the STS-114 shuttle flight took care of this problem.

The Space Shuttle Program resumed flight on 26 July, 2005 with the STS-114 mission of Discovery. This mission to the International Space Station was intended both to test new safety measures implemented since the Columbia disaster, and to deliver supplies to the station. Although the mission succeeded safely, it was not without risk; foam was shed by the external tank, leading NASA to announce future missions would be grounded until this issue was resolved.

The second Return to Flight mission, STS-121 was planned for September 2005, but Discovery's flight preparation was delayed and the mission did not launch until July 4, 2006. With the successful completion of mission STS-121, International Space Station assembly resumed on September 9, 2006 with the STS-115 Space Shuttle mission.

Expeditions to the International Space Station.

All permanent station crews are named "Expedition N", where N is sequentially increased after each expedition. Expeditions have an average duration of half a year. Taxi visitors and space tourists are not counted as Expedition members.

(commander in italics)
PatchLaunch dateFlight upLanding dateFlight downDuration
Expedition 1 William Shepherd - U.S.A.
Yuri Gidzenko - Russia
Sergei Krikalev - Russia
ISS insignia. October 31, 2000
07:52:47 UTC
Soyuz TM-31 March 21, 2001
07:33:06 UTC
STS-102 140.98
Expedition 2 Yuri Usachev - Russia
Susan Helms - U.S.A.
James Voss - U.S.A.
ISS Mission patch 2. March 8, 2001
11:42:09 UTC
STS-102 August 22, 2001
19:24:06 UTC
STS-105 167.28
Expedition 3 Frank L. Culbertson - U.S.A.
Vladimir N. Dezhurov - Russia
Mikhail Tyurin - Russia
ISS Mission patch 3. August 10, 2001
21:10:15 UTC
STS-105 December 17, 2001
17:56:13 UTC
STS-108 128.86
Expedition 4 Yury Onufrienko - Russia
Dan Bursch - U.S.A.
Carl Walz - U.S.A.
ISS Mission patch 4. December 5, 2001
22:19:28 UTC
STS-108 June 19, 2002
09:57:41 UTC
STS-111 195.82
Expedition 5 Valery Korzun - Russia
Sergei Treschev - Russia
Peggy Whitson - U.S.A.
ISS Mission patch 5. 5 June, 2002
21:22:49 UTC
STS-111 December 7, 2002
19:37:12 UTC
STS-113 184.93
Expedition 6 Kenneth Bowersox - U.S.A.
Nikolai Budarin - Russia
Donald Pettit - U.S.A.
ISS Mission patch 6. November 24, 2002
00:49:47 UTC
STS-113 May 4, 2003
02:04:25 UTC
Soyuz TMA-1 161.05
Expedition 7 Yuri Malenchenko - Russia
Edward Lu - U.S.A.
ISS Mission patch 7. April 26, 2003
03:53:52 UTC
Soyuz TMA-2 October 28, 2003
02:40:20 UTC
Soyuz TMA-2 184.93
Expedition 8 Michael Foale - U.S.A.
Alexander Kaleri - Russia
ISS Mission patch 8. October 18, 2003
05:38:03 UTC
Soyuz TMA-3 April 30, 2004
00:11:15 UTC
Soyuz TMA-3 194.77
Expedition 9 Gennady Padalka - Russia
Michael Fincke - U.S.A.
ISS Mission patch 9. April 19, 2004
03:19:00 UTC
Soyuz TMA-4 October 24, 2004
00:32:00 UTC
Soyuz TMA-4 185.66
Expedition 10 Leroy Chiao - U.S.A.
Salizhan Sharipov - Russia
ISS Mission patch 10. October 14, 2004
03:06 UTC
Soyuz TMA-5 April 24, 2005
22:08:00 UTC
Soyuz TMA-5 192.79
Expedition 11 Sergei Krikalev - Russia
John L. Phillips - U.S.A.
ISS Mission patch 11. April 15, 2005
00:46:00 UTC
Soyuz TMA-6
October 11, 2005
01:09:00 UTC
Soyuz TMA-6 179.02
Expedition 12 William McArthur - U.S.A.
Valery Tokarev - Russia
ISS Mission patch 12. October 1, 2005
03:54:00 UTC
Soyuz TMA-7
April 8, 2006
23:48:00 UTC
Soyuz TMA-7 189.01
Expedition 13 Pavel Vinogradov - Russia
Jeffrey Williams - U.S.A.
Thomas Reiter - Germany
ISS Mission patch 13. March 30, 2006
02:30 UTC (Soyuz)
July 4, 2006
18:38 UTC (STS)
Soyuz TMA-8
September 28, 2006
01:13 UTC (Soyuz)
December 18, 2006 (STS)
Soyuz TMA-8
STS-116 (Reiter)
Expedition 14 Michael Lopez-Alegria - U.S.A.
Mikhail Tyurin - Russia
Sunita Williams - U.S.A.
ISS Mission patch 14. September 18, 2006
04:09 UTC (Soyuz)
Planned: December 8, 2006 (STS)
Soyuz TMA-9
Planned: April 20, 2007 (Soyuz)
July 9, 2007 (STS)
Soyuz TMA-9
STS-118 (Williams)
Expedition 15 Fyodor Yurchikhin - Russia
Clayton Anderson - U.S.A.
Oleg Kotov - Russia
Daniel Tani - U.S.A.
Scheduled for 9 April, 2007-October 17, 2007
Expedition 16 Peggy Whitson - U.S.A.
Yuri Malenchenko - Russia
Léopold Eyharts - France
Robert Thirsk - Canada
Koichi Wakata - Japan
Scheduled for October 6, 2007-March 4, 2008

The International Space Station is the most-visited spacecraft in the history of space flight. As of September 11, 2006, it has had 159 (non-distinct) visitors. Mir had 137 (non-distinct) visitors (See Space station). The number of distinct visitors of the International Space Station is 124 (see list of International Space Station visitors).

Miscellaneous info on the International Space Station.

Yuri Malenchenko.
Yuri Malenchenko was the first person who was married in space.

Space tourism and weddings at The International Space Station.

As of 2006 there have been four space tourists to the International Space Station, each spending ca. US$20 million; they went there aboard a Russian supply mission. There has also been a space wedding when cosmonaut Yuri Malenchenko on the station married Ekaterina Dmitrieva, who was in Texas.

Golf Shot Around The World is a planned event in which, on an EVA, a special golf ball, equipped with a tracking device, is hit from the station and sent into its own Low Earth orbit. The Russian space agency has consented, for a fee paid by a Canadian golf equipment manufacturer. The task was supposed to be performed on Expedition 13, but the event was postponed, and will take place on Expedition 14.

Microgravity in the International Space Station.

At the International Space Station altitude, the gravity from the Earth is still 88% that at sea level. The state of weightlessness on the International Space Station is sometimes explained as a result of the cancellation of the gravitational force by the centrifugal force produced by the International Space Station orbiting the planet. A more formal explanation is that the state of weightlessness is a result of the fact that the International Space Station is in constant free fall, which according to the Equivalence principle is indiscernable from being in a state where all forces, including gravity, are absent. However, due to (1) the drag resulting from the residual atmosphere, (2) vibratory acceleration due to mechanical systems and the crew on board the ISS, (3) orbital corrections by the on-board gyroscopes or thrusters, and (4) the spatial separation from the real centre of mass of the ISS, the environment on the station is often described as microgravity, with a level of gravity on the order of 2 to 1000 millionths of g (the value varies with the frequency of the disturbance; the low value occurs at frequencies below 0.1 Hz, the higher value at frequencies of 100 Hz or more).

International Space Station in popular culture.

In Star Trek: Deep Space Nine, Captain Benjamin Sisko had a model of the International Space Station in his office on Deep Space Nine. The International Space Station also appeared in the opening credits of Star Trek: Enterprise.

The International Space Station played a minor role in the 2004 movie, The Day After Tomorrow.

More About The International Space Station.

Expedition 12 Completes First Spacewalk

Nov 8, 2005 - Expedition 12 Flight Engineer Valery Tokarev and Commander Bill McArthur spent over 5 hours outside the International Space Station, performing their first spacewalk. During their time in space, the two men installed a new video camera on the P1 truss structure and jettisoned a probe attached to the exterior of the station. The mission started an hour later than planned because of a misaligned valve in the Quest airlock that needed troubleshooting.

Expedition 11 Returns to Earth

Oct 11, 2005 - The crew of Expedition 11 landed safely in the steppes of Kazakhstan Monday morning, after spending 179 days on board the International Space Station. Space tourist Greg Olsen was also in in the Soyuz TMA capsule, having spent a week in space. The recovery team reached the crew within minutes, and found them safe and healthy. There was an unexpected loss of communications with the Soyuz while it reentered the Earth's atmosphere, but communications were reestablished, and there were no other problems with the landing.

Space Tourist and New Crew Arrive at the Space Station

Oct 3, 2005 - The Soyuz spacecraft carrying the crew of Expedition 12 and space tourist Greg Olsen docked with the International Space Station on Monday. The visitors were greeted by the crew of Expedition 11, who have been on board the station for nearly 6 months. Olsen will conduct several experiments on the station, and then return with the crew of Expedition 11 in about a week.

Progress 19 Brings Spare Parts to the Station

Sep 13, 2005 - An unpiloted Progress cargo ship docked to the Zvezda module of the International Space Station on Saturday, delivering supplies to the crew of Expedition 11. The supplies include food, water, fuel, oxygen, air, clothing and experimental hardware. Also on board are spare parts for the Russian Vozdukh carbon dioxide removal system and the Elektron oxygen generator. The astronaut will try and repair the Elektron next week to bring it back into service.

Cosmonaut Will Break the Record for Spaceflight

Aug 15, 2005 - Cosmonaut Sergei Krikalev is about to break the record for human spaceflight on Tuesday. Currently on board the International Space Station, he will tie the current record holder, Sergei Avdeyev, when reaches 748 days in orbit. Krikalev has been on two long-duration stays on the Mir space station, two flights on the Space Shuttle, and two trips on the Space Station. He was aboard Mir when the Soviet Union collapsed, the first Russian to fly on the Shuttle, and a member of the first crew for the International Space Station.

Progress 18 Docks

Jun 20, 2005 - The unpiloted Progress 18 cargo ship docked with the International Space Station on Saturday, delivering a fresh batch of supplies. The spacecraft nearly connected automatically to the Zvezda Service Module, but Commander Sergei Krikalev had to take over because of communications problems between ground control and the Progress.ship. It's loaded up with food, propellant, oxygen, water, spare parts, and experiment hardware. It also brought along the new camera system that will help astronauts inspect the space shuttle for damage when it docks.

18th Progress Lifts Off

Jun 17, 2005 - An unmanned Russian Progress cargo spacecraft lifted off from the Baikonur cosmodrome Thursday evening, beginning its journey to resupply the International Space Station. On board the 18th Progress cargo ship are two tonnes of supplies, including food, water, air, fuel, equipment and personal items. The spacecraft will reach the station and dock automatically to the Zvezda module on Saturday.

ESA Astronaut Will Visit Station for Months

Apr 28, 2005 - European Space Agency astronaut Thomas Reiter from Germany will become the first from the agency to spend several months on board the International Space Station. Although ESA astronauts have visited the station several times before, they usually only stick around for about a week, perform a bunch of experiments, and then join the returning crew for the Soyuz flight home. Reiter will be launched with the Space Shuttle flight STS-121, currently planned for July 2006.

Expedition 10 Lands Safely

Apr 25, 2005 - The Soyuz capsule carrying the crew of Expedition 10 and ESA astronaut Roberto Vittori landed safely in north-central Kazakhstan early Monday, approximately 85 km (53 miles) from the town of Arkalyk. Recovery personnel reached the spacecraft within minutes of their touchdown, and the crew was airlifted out safely. Leroy Chiao and Salizhan Sharipov spent a total of 192 days in space, and completed two spacewalks.

Expedition 11's Soyuz Docks

Apr 16, 2005 - The newest residents of the International Space Station arrived at their destination on Saturday, as their Soyuz TMA-6 capsule docked automatically. Hatches between the spacecraft and station were opened a few hours later, and the three crew members joined the two men of Expedition 10 on board the station. Commander Sergei Krikalev and astronaut John Phillips will remain on the station until October 2005, while ESA Astronaut Roberto Vittori will return in about a week with Leroy Chiao and Salizhan Sharipov.

Expedition 11 Blasts Off for the Station

Apr 15, 2005 - The 11th crew to man the International Space Station blasted off from the Baikonur Cosmodrome on Thursday. The Soyuz TMA capsule carrying Cosmonaut Sergei Krikalev, Astronaut John Phillips, and European Space Agency Astronaut Roberto Vittori of Italy reached orbit a few minutes after launch. Krikalev and Phillips will replace the current crew, while Vittori will only remain on the station for a week and then return with Expedition 10. The Soyuz will dock on Saturday.

Spacewalkers Release Mini-Satellite

Mar 28, 2005 - The astronauts on board the International Space Station spent a few hours walking around in space today. They installed new antennas to help guide the new European "Jules Verne" cargo ship when it launches next year. They also released a tiny Russian satellite by hand - flight engineer Salizhan Sharipov "threw" it off the station at a velocity of about 1 metre/second. The whole spacewalk finished ahead of schedule, and the two men returned inside after spending about 4.5 hours in space.

Progress Docks with Station

Mar 3, 2005 - The 17th Progress cargo ship docked with the International Space Station on Tuesday, delivering a pile of supplies. The ship is carrying air, water, food, equipment, and science experiments. But one of its most important cargoes is a new high resolution digital camera that the astronauts will use to inspect space shuttles when they dock with the station. The docking was completed autonomously; however, cosmonaut Salizhan Sharipov was ready at the manual controls to take over if there had been a problem.

Supply Ship Blasts Off With Special Camera

Mar 1, 2005 - The 17th Progress cargo ship blasted off from the Baikonur Cosmodrome yesterday, carrying two tonnes of supplies for the International Space Station and a special camera designed to inspect the Space Shuttle for damage. The Progress should reach the station by Wednesday, and dock in afternoon. The previous cargo ship, now filled with garbage, was detached from the station on Sunday, and will reenter and burn up in the Earth's atmosphere on March 9.

Cargo Ship Ready for Liftoff with Station Supplies

Feb 28, 2005 - An unmanned Progress cargo ship is about to blast off from Kazakhstan, carrying much needed supplies to the International Space Station. If everything goes well, the 17th Progress mission will lift off today carrying a variety of supplies: food, water, air, spare parts, and life support equipment. One important piece of cargo is a new digital camera that the station crew will use to inspect the space shuttle for damage when it docks.

Expedition 10 Completes Spacewalk

Jan 26, 2005 - The crew of the International Space Station are safely back inside after completing a 5+ hour spacewalk. During their time in space, Commander Leroy Chiao and Flight Engineer Salizhan Sharipov installed a $10 million German prototype robot arm which will demonstrate the feasibility of keeping a repair robot outside the station. Sharipov discovered residue on the outside of three vents that the station uses to expel waste products into space. This is unusual, and could be contributing to the recent problems with air on board the station. The crew of Expedition 10 will make another spacewalk in late March.

Crew Begins Unloading Progress

Dec 27, 2004 - An unmanned Progress cargo ship reached the International Space Station on Sunday, and the two-man crew got right to work unloading its cargo. Cosmonaut Salizhan Sharipov and NASA astronaut Leroy Chiao had both cut their food consumption by 10% to stretch out supplies, and had each lost a few kg during the last month. The Progress ship is carrying 2.5 tonnes of supplies, including a 15kg (33 pound) gift package for each man.

Cargo Ship Launches with Supplies for the Station

Dec 24, 2004 - An unmanned Progress cargo ship lifted off from Kazakhstan over night, carrying much needed supplies for the International Space Station. Food supplies were getting low on board the station, so the Progress is loaded up with a 112-day supply of food, as well as water, air, propellant, and additional spare parts for the station. It's expected to dock automatically on December 25th to the aft port of the Zvezda living quarters module.

Additional Food Readied for Astronauts

Dec 13, 2004 - An unpiloted Progress spacecraft is being readied at the Baikonur Cosmodrome in Kazakhstan to ferry food and additional supplies to the crew of Expedition 10 on board the International Space Station. An additional 70 food containers have been added to the spacecraft's manifest to refill the station's onboard supplies. If all goes well, Progress 16 will launch on December 23, and dock with the station 2 days later.

Astronauts Running Low on Food

Dec 6, 2004 - The 2-man crew onboard the International Space Station are going to be rationing their food carefully between now and the arrival of a Progress cargo ship on December 25 which will be carrying additional supplies. It appears that these astronauts, and the previous occupants, have been eating more food than engineers were predicting. This next Progress flight will contain extra food supplies, but if there's a problem with the mission and the cargo ship is destroyed, Commander Leroy Chiao and Russian flight engineer Salizhan Sharipov may have to evacuate the station, as additional supplies can't reach them in time.

Links For The International Space Station.

Boeing Space Station
Earth Station
International Space Station Expert Q & A
Mir Watch

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