International Space Station: Modules, Research and Future
Why in the news
NASA sent up a fresh crew to the International Space Station on 14 March 2025 to take over from two astronauts who had been stranded there. The relief team was due to dock soon after, enabling a smooth handover.
Key facts
- The ISS is a habitable artificial satellite and microgravity research laboratory orbiting at roughly 400 km (about 250 miles).
- Partners: NASA (USA), Roscosmos (Russia), ESA (Europe), JAXA (Japan) and CSA (Canada).
- It has over 15 pressurised modules and is about as large as a football field.
- Solar arrays supply up to 120 kilowatts, enough for life support and instruments.
- Crew exercise about two hours daily to offset muscle and bone loss in weightlessness.
Major modules
| Module | Origin | Launch | Purpose |
|---|---|---|---|
| Zarya | Russia | 1998 | First module; power, propulsion, storage |
| Destiny | USA | 2001 | US laboratory |
| Columbus | Europe | 2008 | Lab for physics, biology, astronomy |
| Kibo | Japan | 2008 | One of the largest pressurised modules |
| Pirs | Russia | Not stated | Docking port and airlock for spacewalks |
History
- In the 1980s NASA and Soviet counterparts discussed a permanent orbital presence, but Cold War tension limited cooperation.
- In 1998 the US, Russia, Canada, Europe and Japan agreed to collaborate.
- Assembly began with Zarya on 20 November 1998; the first long-term crewed mission followed in November 2000, starting continuous human presence.
Life on board
- Astronauts float in microgravity and sleep in small quarters using a sleeping bag fixed to the wall.
- Meals are specially packed and rehydrated; a water recovery system recycles sweat, urine and other water.
- Satellite links allow calls, emails and video chats with mission control and families.
- Docking ports accept Soyuz, Progress, SpaceX Dragon and other craft from all five agencies.
Research areas
- Space medicine: bone density loss, muscle atrophy, vision change and psychological effects.
- Biotechnology: growing plants, cells and microbes in microgravity, useful for long missions such as a Mars trip.
- Observation: imaging Earth for climate, weather and disasters, plus studying deep space and testing new technology.
Future
- Planned for 15 years of use, the ISS has been extended several times.
- Private firms such as SpaceX and Blue Origin are developing their own stations.
- NASA’s Artemis Program targets the Moon and eventually Mars; the Lunar Gateway would orbit the Moon as a staging post.
Exam angle
- Five partner agencies and their countries.
- First module: Zarya (1998). European lab: Columbus. Japanese lab: Kibo.
- Related missions: Artemis Program, Lunar Gateway.