space station
Space station is an artificial space capsule running in outer space, broadly a spacecraft. Compared with the spacecraft, the space station is not necessarily equipped with astronauts launched off, do not necessarily have to promote and landing equipment, but the space station for human long-term residence design, can be used as astronauts in space and Work place. The space station can provide conditions such as low gravity, space environment, etc. that can not be provided by ground laboratory facilities, and are mainly used for various scientific research (especially the effects of long-term retention of the universe on the human body). At present, all human space stations are built on the Earth's satellite orbit, in order to space station personnel and supplies and transportation, the need for other spacecraft with. ...