Photo: Zero Robotics (SPHERES ZR) Flying Inside the Space Station

Two bowling-ball-sized free-flying satellites called Synchronized Position Hold, Engage, Reorient, Experimental Satellites Zero Robotics (SPHERES ZR) are pictured during a test session in the Kibo laboratory of the International Space Station. ISS031-E-140672 (22 June 2012) --- high res (1.6 M) low res (91 K)

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