Alexander Gerst is a German European Space Agency astronaut and geophysicist, who was selected in 2009 to take part in space training. He was part of the International Space Station Expedition 40 and 41 from May to November 2014. Gerst returned to space on 6 June 2018, as part of Expedition 56/57. He was the Commander of the International Space Station. He returned to Earth on 20 December 2018. From Wikipedia
