This description explores the International Space Station (ISS), a unique and incredible feat of human engineering and space exploration. The ISS is a habitable artificial satellite that orbits the Earth at an altitude of approximately 400 km. It is the largest human-made object in space and has been continuously occupied since
The Tiangong space station, officially the China Space Station, is China's first permanently crewed space station, in low Earth orbit since 2021. Operated by the China Manned Space Agency (CMSA), it is China's third space station, under the Tiangong subprogram of the China Manned Space Program. A space laboratory, it hosts experiments on bioastronautics, microgravity, materials science and space technology. Crews of three travel aboard the Shenzhou spacecraft for missions of about six months, with temporary crew sizes of six during handovers. Cargo missions use the Tianzhou spacecraft. It is one of two operational space stations, alongside the International Space Station (ISS).