Endeavor lifts off for final flight

The space shuttle Endeavour lifts off from Kennedy Space Center on its final mission to the international space station.

Space shuttle Endeavour flies past the US Flag after launch at Cape Canaveral, Fla., on Monday, May 16, 2011.  (AP Photo/John Raoux)

Space shuttle Endeavour flies past the US Flag after launch at Cape Canaveral, Fla., on Monday, May 16, 2011. (AP Photo/John Raoux)

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