SPACE.com -- Railway to the Sky? NASA Ponders New Launch System - 3 views
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A team of engineers from NASA's Kennedy Space Center in Florida and some of the agency's other field centers are looking into this and other novel launch systems based on cutting-edge technologies.
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The launch system would require some advancements of existing technologies, but it wouldn't need any brand-new technologies to work
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Scramjet vehicles could be used as a basis for a commercial launch program
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I wonder if they are also working with that SCRAMSPACE initiative in Australia that was presented at ESTEC a while back...
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what about a space elevator!!! quiet old concept (1895), see this link on wiki http://en.wikipedia.org/wiki/Space_elevator