This ATK (Alliant Techsystems) engine runs on liquid oxygen and methane. Because methane is abundant in the atmosphere of many planets, the new technology would allow spacecraft to stop and refuel along the way. This engine will also allow NASA astronauts to travel long distances without carrying all of their fuel with them. TIME magazine named the engine one of the best innovations of 2007. To learn more about ATK's rocket engines go to http://www.atk.com.
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