Expedition 52 crew members wave farewell prior to boarding the Soyuz MS-05 rocket

Expedition 52 flight engineer Randy Bresnik of NASA, top, flight engineer Paolo Nespoli of ESA (European Space Agency), middle, and flight engineer Sergei Ryazanskiy of Roscosmos, bottom, wave farewell prior to boarding the Soyuz MS-05 rocket for launch, Friday, July 28, 2017 at the Baikonur Cosmodrome in Kazakhstan. Ryazanskiy, Bresnik, and Nespoli will spend the next four and a half months living and working aboard the International Space Station.