NASA Expedition 50-51 prime crew members French astronaut Thomas Pesquet of the European Space Agency (left) and Russian cosmonaut Sergey Ryzhikov of Roscosmos operate hardware for the MARES experiment inside the International Space Station Columbus module November 29, 2016 in Earth orbit. MARES investigates the effects of microgravity on the human muscular system.

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NASA Expedition 50-51 prime crew members French astronaut Thomas Pesquet of the European Space Agency (left) and Russian cosmonaut Sergey Ryzhikov of Roscosmos operate hardware for the MARES experiment inside the International Space Station Columbus module November 29, 2016 in Earth orbit. MARES investigates the effects of microgravity on the human muscular system.

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Location: Earth orbit
Photo credit: © NASA Photo / Alamy / Afripics
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