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Shuttle in transit

The space shuttle Endeavor used to cruise around Earth at a mind-boggling 17,500 mph. Its last journey was a little slower. The spaceship hitched a ride on a Boeing 747, taking a celebratory final flight over landmarks like San Francisco's Golden Gate Bridge before landing in Los Angeles and being rolled through the streets at 2 mph to the California Science Center, allowing plenty of memorable photo ops for spectators. (Carla Thomas/AP Photo/NASA)

Year in Review 2012: Most Viral Photos