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The International Space Station (ISS) is a special satellite that orbits Earth every 90 minutes at a speed of 28,000 km/h. About ten astronauts live and work on it. They do experiments, fix equipment, and sometimes do spacewalks outside the station.

When they’re not working, they read or take photos. Since there's no gravity in space, astronauts need to exercise for two hours a day to keep their muscles strong.