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Melting at the base of this Texas-sized ice pack in the Amundsen Sea off Antarctica could lead to significant ocean level rise in the long term. This image of the ice shelf was taken on the first flight of Ice Bridge from an altitude of 20,000 feet. NASA hide caption
The Ares I-X test rocket takes off Wednesday from the Kennedy Space Center in Cape Canaveral, Fla. John Raoux/AP hide caption