A Today astronauts spend a great deal of time in space stations. A space station is a floating space base. It is like a spaceship designed so that astronauts can live in outer space for weeks, months or even years at a time. Unlike a spacecraft, a space station cannot take off or land on planets. Other vehicles are used to transport people and materials to and from the station. Space stations are used for studying the effect of long-term space flights on the human body as well as for space research.