Space shuttle Endeavour sits on the launch pad behind the countdown clock at the Kennedy Space Center at Cape Canaveral, Fla., on Friday, April 29, 2011 after NASA scrubbed the launch for a technical problem. (AP Photo/J. David Ake)

Associated Press
Space shuttle Endeavour sits on the launch pad behind the countdown clock at the Kennedy Space Center at Cape Canaveral, Fla., on Friday, April 29, 2011 after NASA scrubbed the launch for a technical problem.  (AP Photo/J. David Ake)
Space shuttle Endeavour sits on the launch pad behind the countdown clock at the Kennedy Space Center at Cape Canaveral, Fla., on Friday, April 29, 2011 after NASA scrubbed the launch for a technical problem.
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