Tiangong-1 was China`s first experimental space station and was used as a testbed for the ambitious Tiangong-Project.
Only about one month after its launch in 2011 the station already recieved its first visitor: an unmanned Shenzhou spacecraft. This marked China´s first successful docking maneuver in space. Later the station was visited by two manned missions, which included China´s first female Taikonaut.
In 2016, however, control over the station was lost and it reentered the atmosphere two years later.
The model has a medium difficulty.