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• 21:47, 2 September 2013 Hkhenson talk contribs uploaded File:SkylonLaser.jpg ( Laser powered modified Skylon near the end of acceleration to LEO on hydrogen heated by 3 GW of lasers located in GEO. The exhaust velocity of the hot hydrogen is close to 7.5 km/s. Base artwork courtesy of Reaction Engines, Ltd., modified by Barbar...)