The ISS serves as a microgravity and space environment research laboratory, where astronauts conduct experiments and studies in various fields such as biology, physics, and technology. It also serves as a platform for international collaboration and exploration of space.
The ISS has been continuously occupied since November 2, 2000, making it over 20 years of human presence in space. However, the first module of the ISS was launched in 1998, and it has been continuously expanded and upgraded since then.
The ISS can accommodate up to six people at a time, although the average number of crew members is usually three to four. This is due to the limited space and resources available on the ISS.
Astronauts undergo rigorous training and preparation before their mission to the ISS. This includes physical and psychological training to help them adapt to the microgravity environment. Once on the ISS, astronauts also follow a strict schedule that includes exercise, work, and leisure time to maintain their physical and mental health.
The ISS is regularly resupplied by spacecraft from various countries, including the United States, Russia, Japan, and Europe. These spacecraft deliver food, water, oxygen, and other supplies to the ISS crew. The ISS also has systems in place for recycling and reusing resources, such as water and air, to reduce the need for constant resupply missions.