Stock Photo - Astronauts and cosmonaut aboard the International Space Station celebrate 100 days in space with a traditional flight patch. Expedition 50 Flight Engineers Thomas Pesquet of ESA (European Space Agency (left), Oleg Novitskiy of Roscosmos (middle) and Peggy Whitson of NASA (right) launched to the station Nov. 17, 2016.

Stock Photo: Astronauts and cosmonaut aboard the International Space Station celebrate 100 days in space with a traditional flight patch.

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