NASA International Space Station Expedition 51 Soyuz MS-04 mission prime crew member American astronaut Jack Fischer lays upside down on a tilt table to test his vestibular system during pre-launch activities at the Cosmonaut Hotel April 13, 2017 in Baikonur, Kazakhstan. (photo by Victor Zelentsov /NASA via Planetpix)

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Photo credit: © NASA Photo / Alamy / Afripics
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