After 167 days aboard the International Space Station, the crew of Expedition 42 is about to head home. American astronaut Barry Wilmore, and Russian cosmonauts Alexander Samokutyaev and Elena Serova will begin their controlled fall to Earth at 6:44 PM ET aboard a Soyuz capsule. NASA will livestream coverage (seen above) of the undocking, and will continue until the crew is expected to land in Kazakhstan at 10:07 PM ET.
The ISS will be solely occupied by the three-person Expedition 43 crew until March 27th, when they will be joined by NASA astronaut Scott Kelly and Roscosmos cosmonauts Mikhail Kornienko and Gennady Padalka. Kelly and Kornienko will spend an entire year aboard the station as the various space agencies attempt to learn more about the effects of weightlessness on the human body.