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Posted by Jim Logajan on January 28, 2006, 7:38 pm
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psturroc@gmail.com wrote:
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> Are there any rocket fuels -- existing or potential -- that are less
> polluting than kerosene or hydrogen? If so, are any of them
> economically feasible?
I'm surprised no one has suggested solar power. ;-)
A simple ground or space based variable-focus mirror and a solar-heated
ramjet is all you need! Needs, ah, a few details worked out....
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> polluting than kerosene or hydrogen? If so, are any of them
> economically feasible?