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Date: 2013-07-02 14:07:09Single-stage-to-orbit Spacecraft propulsion Hydrogen-powered aircraft Rockwell X-30 Spaceplanes Langley Research Center Hypersonic speed Aerodynamics DARPA Aerospace engineering Space technology Aviation | Add to Reading ListSource URL: crgis.ndc.nasa.govDownload Document from Source WebsiteFile Size: 66,55 KBShare Document on Facebook |