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Re:Elon Musk’s SpaceX Is Raising Money at a Valuation Approa... by JoeAltmaier on Tuesday August 19, 2014 @12:01PM (#8198045)
The 'microwave thruster' article posted recently circumvents that problem - no reaction mass necessary. A Mars mission is now supposed to be practical, energywise.
Re:Elon Musk’s SpaceX Is Raising Money at a Valuation Approa... by idlewords on Tuesday August 19, 2014 @12:04PM (#8198061)
Oh yeah! And the rocket can use faster-than-light neutrinos to avoid annoying latency when talking to Houston.