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This image provided by NASA shows the intersecting thin line of Earth's atmosphere with the International Space Station's solar array wings photographed Thursday May 20, 2011 by an STS-134 crew member while space shuttle Endeavour remains docked with the station. (AP Photo/NASA)

This image provided by NASA shows the intersecting thin line of Earth's atmosphere with the International Space Station's solar array wings photographed Thursday May 20, 2011 by an STS-134 crew member while space shuttle Endeavour remains docked with the station.

Endeavour's final launch

Second-to-last NASA shuttle blasts off.