IIn 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)

This 1963 photo provided by NASA shows an F-1 Engine for the Saturn V S-IC (first) stage at Marshall Space Flight Center in Huntsville, Ala. (AP)

Prepping Apollo 11 before launch in 1969 (AP Photo)

Read: NASA Testing Vintage Engine from Apollo 11 Rocket