Stock Photo - Astronaut Jeffrey N. Williams, Expedition 13 NASA space station science officer and flight engineer, does a check of the Synchronized Position Hold, Engage, Reorient, Experimental Satellites (SPHERES) Beacon Beacon Tester in the Destiny laboratory of the International Space Station.

Stock Photo: Astronaut Jeffrey N. Williams, Expedition 13 NASA space station science officer and flight engineer, does a check of the Synchronized Position Hold, Engage.

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