CANOGA PARK, Calif. - Pratt and Whitney Rocketdyne completed another major subassembly for NASA's first J-2X rocket engine. The turbopump assembly follows the successful assembly of the oxidizer turbopump, which delivers high-pressure liquid oxygen to the main injector. The engine’s first hot-fire tests are planned for early 2011 at Stennis Space Center, Miss. Pratt & Whitney Rocketdyne is headquartered in Canoga Park and has facilities in Huntsville, Ala.; Kennedy Space Center, Fla.; West Palm Beach, Fla.; and Stennis Space Center. (Source: PRNewswire, 12/21/10, NASA, 12/22/10) Previous story