Northrop Grumman Corp.'s Redondo Beach-based Space Technology sector said Thursday that it has completed manufacturing and integrating a spacecraft engine that runs on the "green," or non-toxic, propellants of liquid oxygen and liquid methane for possible use on NASA human exploration missions to the Moon, Mars and beyond.
Northrop's TR408 engine can potentially use green propellants produced from lunar or Martian soil, Northrop said.

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