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To be honest, I think 65 years is optimistic given the current state of things. I want to know what energy source can support a society hurling millions of averages Joe's into space.
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The energy is easy is small potatoes. Look at what the US goes through. Most of us can afford enough LOX and kerosene to launch ourselves into orbit. Or LOX and hydrogen. The reusable, safe, suborbital space plane is the expensive part.