Since there always has to be a certain number of astronauts manning the station at all times, one of the main aspects of the mission was to transport a new t...

Since there always has to be a certain number of astronauts manning the station at all times, one of the main aspects of the mission was to transport a new team to the station and bring back some members of the previous team back to Earth.

quote by Philippe Perrin
Submitted by Lucian Velea
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