Stock Photo - Astronaut Christopher Cassidy, STS-127 mission specialist, uses a handheld laser ranging device -- designed to measure the range between two spacecraft -- through one of the overhead windows on the aft flight deck of Space Shuttle Endeavour after undocking from the International Space Station.

Stock Photo: Astronaut Christopher Cassidy, STS-127 mission specialist, uses a handheld laser ranging device -- designed to measure the range between two spacecraft --.

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