NASA astronaut Chris Cassidy views an exhibit on the Synchronized Position Hold, Engage, Reorient, Experimental Satellites (SPHERES) - Slosh experiment at NASA's Tech Day on the Hill, Thursday, June 15, 2017, at the Rayburn House Office Building in Washington. Photo Credit: (NASA/Joel Kowsky)

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Photo credit: © NG Images / Alamy / Afripics
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