![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. 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.](http://img.enquoted.com/since-there-always-has-to-be-a-certain-number-of-astronauts-manning-the-s.webp)
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.
aspect astronaut back