In this picture made available by NASA, the last crew of the 

In this picture made available by NASA, the last crew of the space shuttle Endeavour stands together on Launch Pad 39A in front of its external fuel tank and solid rocket boosters at the Kennedy Space Center in Cape Canaveral, Fla. on Thursday, April 28, 2011, one day before its final flight. From left are Mission Specialists Michael Fincke, Andrew Feustel, Pilot Greg H. Johnson, Commander Mark Kelly, European Space Agency astronaut Roberto Vittori and Mission Specialist Greg Chamitoff. (AP Photo/NASA, Kim Shiflett)
Associated Press
In this picture made available by NASA, the last crew of the space shuttle Endeavour stands together on Launch Pad 39A in front of its external fuel tank and solid rocket boosters at the Kennedy Space Center in Cape Canaveral, Fla. on Thursday, April 28, 2011, one day before its final flight. From left are Mission Specialists Michael Fincke, Andrew Feustel, Pilot Greg H. Johnson, Commander Mark Kelly, European Space Agency astronaut Roberto Vittori and Mission Specialist Greg Chamitoff.
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