NASA testing Apollo 11 rocket engine

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.

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)

FILE - In this July 16, 1969 file photo provided by NASA, the Saturn V rocket that launched Neil Armstrong, Buzz Aldrin and Michael Collins on their Apollo 11 moon mission lifts off at Cape Kennedy, Fla. For more than four decades, the powerful engines that helped boost the Apollo 11 mission to the moon have rested in the Atlantic. Now Internet billionaire and space enthusiast Jeff Bezos, CEO of Amazon.com, wants to raise at least one of them to the surface. (AP Photo/NASA, File)

FILE - In this July 20, 1969, file photo, provided by NASA, Apollo 11 astronauts Neil Armstrong and Edwin E. "Buzz" Aldrin, the first men to land on the moon, plant the U.S. flag on the lunar surface. The family of Neil Armstrong, the first man to walk on the moon, says he has died at age 82 on Saturday, Aug. 25, 2012. Armstrong commanded the Apollo 11 spacecraft that landed on the moon July 20, 1969. He radioed back to Earth the historic news of "one giant leap for mankind." (AP Photo/NASA, File)

FILE - This July 20, 1969 file photo released by NASA shows astronaut Edwin E. "Buzz" Aldrin Jr. posing for a photograph beside the U.S. flag deployed on the moon during the Apollo 11 mission. The family of Neil Armstrong, the first man to walk on the moon, says he has died at age 82. A statement from the family says he died following complications resulting from cardiovascular procedures. It doesn't say where he died. Armstrong commanded the Apollo 11 spacecraft that landed on the moon July 20, 1969. He radioed back to Earth the historic news of "one giant leap for mankind." Armstrong and fellow astronaut Edwin "Buzz" Aldrin spent nearly three hours walking on the moon, collecting samples, conducting experiments and taking photographs. In all, 12 Americans walked on the moon from 1969 to 1972. (AP Photo/NASA, Neil A. Armstrong, file)

FILE - This July 20, 1969 file photo released by NASA shows astronaut Edwin E. "Buzz" Aldrin Jr. posing for a photograph beside the U.S. flag deployed on the moon during the Apollo 11 mission. The family of Neil Armstrong, the first man to walk on the moon, says he has died at age 82. A statement from the family says he died following complications resulting from cardiovascular procedures. It doesn't say where he died. Armstrong commanded the Apollo 11 spacecraft that landed on the moon July 20, 1969. He radioed back to Earth the historic news of "one giant leap for mankind." Armstrong and fellow astronaut Edwin "Buzz" Aldrin spent nearly three hours walking on the moon, collecting samples, conducting experiments and taking photographs. In all, 12 Americans walked on the moon from 1969 to 1972. (AP Photo/NASA, Neil A. Armstrong, file)

FILE - In this July 20, 1969 file photo, a footprint left by one of the astronauts of the Apollo 11 mission shows in the soft, powder surface of the moon. Commander Neil A. Armstrong and Air Force Col. Edwin E. "Buzz" Aldrin Jr. became the first men to walk on the moon after blastoff from Cape Kennedy, Fla., on July 16, 1969. The family of Neil Armstrong, the first man to walk on the moon, says he died Saturday, Aug. 25, 2012, at age 82. A statement from the family says he died following complications resulting from cardiovascular procedures. It doesn't say where he died. Armstrong commanded the Apollo 11 spacecraft that landed on the moon July 20, 1969. He radioed back to Earth the historic news of "one giant leap for mankind." Armstrong and fellow astronaut Edwin "Buzz" Aldrin spent nearly three hours walking on the moon, collecting samples, conducting experiments and taking photographs. In all, 12 Americans walked on the moon from 1969 to 1972. (AP Photo/NASA)

FILE - In this July 20, 1969 file photo, a footprint left by one of the astronauts of the Apollo 11 mission shows in the soft, powder surface of the moon. Commander Neil A. Armstrong and Air Force Col. Edwin E. "Buzz" Aldrin Jr. became the first men to walk on the moon after blastoff from Cape Kennedy, Fla., on July 16, 1969. The family of Neil Armstrong, the first man to walk on the moon, says he died Saturday, Aug. 25, 2012, at age 82. A statement from the family says he died following complications resulting from cardiovascular procedures. It doesn't say where he died. Armstrong commanded the Apollo 11 spacecraft that landed on the moon July 20, 1969. He radioed back to Earth the historic news of "one giant leap for mankind." Armstrong and fellow astronaut Edwin "Buzz" Aldrin spent nearly three hours walking on the moon, collecting samples, conducting experiments and taking photographs. In all, 12 Americans walked on the moon from 1969 to 1972. (AP Photo/NASA)

Visitors gather around the Apollo 11 command module “Columbia” that carried astronauts Neil Armstrong, Buzz Aldrin, and Michael Collins on their historic voyage to the Moon and back on July 16 to 24, 1969, at the Smithsonian Institution’s National Aiur and Space Museum in Washington Saturday, Aug. 25, 2012. Neil Armstrong who became a global hero when as a steely-nerved pilot made "one giant leap for mankind" with a small step onto the moon died Saturday. He was 82. (AP Photo/Manuel Balce Ceneta)