Since 1998, when the International Space Station (ISS) launched, there has been a place for astronauts around the world to run experiments in space, from growing food to learning how low-Earth orbit affects the human body.
More recently, the Chinese Tiangong Space Station was fully completed, with its third and final module, the Mengtian, added on Oct. 31, 2022. Tiangong sits at the same height as the ISS.
