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Expedition 56 crew member Alexander Gerst of the European Space Agency- In the Korolev Museum at the Baikonur Cosmodrome in Kazakhstan, the Expedition 56 prime and backup crews pose for pictures May 31 flanking a portrait of Yuri Gagarin, the first human to fly in space. From left to right are the prime crew members, Serena Aunon-Chancellor of NASA, Alexander Gerst of the European Space Agency and Sergey Prokopyev of Roscosmos and the backup crew, Oleg Kononenko of Roscosmos, David Saint-Jacques of the Canadian Space Agency and Anne McClain of NASA. Aunon-Chancellor, Prokopyev and Gerst will launch June 6 in the Soyuz MS-09 spacecraft for a six-month mission on the International Space Station.