Monday marked 15 years since the first crew docked at the International Space Station.
Since then, the station has been continuously inhabited by crews working on advanced science exploring.
The first space crew was commanded by William Shepherd. He and flight engineers Sergei Krikalev and Yuri Gidzenko spent 141 days in space, saw two space shuttle missions and the addition of a solar array truss structure.
The current crew has six members, two of which are spending nearly a year in space.
Experiments today include research on the dynamic loads the space station experiences during spacecraft dockings, space walks and crew exercises.
The space station is also playing a big role in getting humans to mars.
To celebrate the anniversary, NASA has put together some fun memories and images of the space station.