Space station orbit earth

Space stations orbit Earth at an altitude of about 400 km, traveling at 28,000 km/h and completing 16 orbits per day.

About this subject

Space stations are crewed platforms that orbit Earth in low Earth orbit (LEO). The most famous is the International Space Station (ISS), a multinational laboratory operational since 1998. It orbits at an average altitude of 400 km, with an orbital speed of about 28,000 km/h, completing 16 orbits per day. The ISS features modules from Russia, the United States, Europe, Japan, and Canada, serving microgravity research, Earth observation, and technology testing.

Besides the ISS, China operates the Tiangong space station (Heavenly Palace), whose first module launched in 2021. Tiangong orbits at a similar altitude and hosts taikonaut crews for missions up to six months. Future space stations, such as NASA's Lunar Gateway, aim to orbit the Moon, but currently all crewed stations are in Earth orbit. Life aboard relies on advanced life support: water recycling, oxygen generation via electrolysis, and cosmic radiation shielding.

The sensation of floating in microgravity is constant, but astronauts must exercise two hours daily to prevent muscle atrophy and bone loss. Earth views are stunning: sunrises occur every 90 minutes, and phenomena like auroras and lightning are visible from a unique perspective. To date, the ISS has hosted over 260 individuals from 20 countries, and Tiangong has already completed multiple crewed missions.

Frequently Asked Questions

How many orbits does the ISS complete per day?

The International Space Station completes about 16 orbits around Earth every 24 hours, traveling at approximately 28,000 km/h.

What is the average orbital altitude of the ISS?

The ISS orbits at an average altitude of 400 km above Earth's surface, with slight variations due to reboost maneuvers.

Does China have its own space station?

Yes, China operates the Tiangong space station, whose first module launched in 2021. It is crewed by taikonauts and conducts scientific experiments.