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Astronaut Chris Cassidy and SPHERES

Astronaut Chris Cassidy and SPHERES
A close-up view of a bowling-ball-sized free-flying satellite known as Synchronized Position Hold, Engage, Reorient, Experimental Satellites, or SPHERES.

ISS036-E-031693 (13 Aug. 2013) — A close-up view of a bowling-ball-sized free-flying satellite known as Synchronized Position Hold, Engage, Reorient, Experimental Satellites, or SPHERES is pictured during a session in the International Space Station’s Kibo laboratory. NASA astronaut Chris Cassidy, Expedition 36 flight engineer, is visible in the background.