NASA abandons single-stage-to-orbit shuttle replacement
Second-generation orbital vehicles will have a two-stage-to-orbit propulsion system based on engines fueled by all kerosene, all hydrogen or a combination of kerosene and hydrogen.
http://std.msfc.nasa.gov/news/sli0501.html
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NASA whittles down field of new launch vehicle concepts
The Space Launch Initiative (SLI), a NASA-wide effort defining the future of human space flight, has completed its first milestone review -- resulting in a narrower field of potential candidates for the nation's second-generation reusable space transportation system.
http://www.spaceflightnow.com/news/n0205/01sli/
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NASA Whittles SLI Concepts To 15
Seeking a safer and cheaper path to space, a team of NASA officials and contractors said Tuesday they will pursue 15 concepts ranked the most promising among hundreds of proposals.
http://www.aviationnow.com/avnow/news/channel_space.jsp?view=story&id=news/ssli0430.xml
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