In this photo provided by SpaceX, the Dragon spacecraft floats on the surface of the Pacific Ocean about 500 miles off Mexico's Baja California on Thursday, May 31, 2012 after its mission to the International Space Station. (AP Photo/SpaceX, Michael Altenhofen)

Associated Press
In this photo provided by SpaceX, the Dragon spacecraft floats on the surface of the Pacific Ocean about 500 miles off Mexico's Baja California on Thursday, May 31, 2012 after its mission to the International Space Station. (AP Photo/SpaceX, Michael Altenhofen)
In this photo provided by SpaceX, the Dragon spacecraft floats on the surface of the Pacific Ocean about 500 miles off Mexico's Baja California on Thursday, May 31, 2012 after its mission to the International Space Station. (AP Photo/SpaceX, Michael Altenhofen)
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