In this image taken from video, NASA engineers test fire a key part of a rocket engine left over from the 1960s-era Apollo moon missions on Thursday, Jan. 24, 2013, in Huntsville, Ala. Engineers hope to gain valuable knowledge from the engine, which was originally supposed to power the Apollo 11 moon mission in 1969 but was grounded by a problem. (AP Photo/Jay Reeves)
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