S131-E-007302 (7 April 2010) --- NASA astronauts Alan Poindexter (left), STS-131 commander; Stephanie Wilson and Rick Mastracchio, both mission specialists, look through overhead windows on the aft flight deck of space shuttle Discovery during flight day three activities. Wilson is using a handheld laser ranging device -- designed to measure the range between two spacecraft.
Date April 7, 2010