S134-E-010933 (30 May 2011) --- NASA astronauts Greg H. Johnson (left), STS-134 pilot; Michael Fincke (center) and Greg Chamitoff, both mission specialists, are busy on the aft flight deck of space shuttle Endeavour during undocking and fly-around operations with the International Space Station on flight day 15. Chamitoff is using a handheld laser ranging device -- designed to measure the range between two spacecraft -- through one of the overhead windows.

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