FOR STORY ESPACIO O ESPOSA - FILE - In this Feb. 4, 2011 file photo, astronaut Mark Kelly prepares to discuss his decision to command the final flight of the Space Shuttle Endeavor during a news ... more 
FOR STORY ESPACIO O ESPOSA - FILE - In this Feb. 4, 2011 file photo, astronaut Mark Kelly prepares to discuss his decision to command the final flight of the Space Shuttle Endeavor during a news conference at Johnson Space Center in Houston. Kelly's wife, Representative Gabrielle Giffords is recuperating from a gunshot wound to the head in a Houston hospital. less 
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Associated Press | Photo By Michael Stravato, File
Fri, Feb 25, 2011 6:18 PM EST