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What are the market forces driving deeper space exploration? There aren't any I can think of except recreation and science experiments.

What's hot right now in aeronautics seems to be better communication and navigation satellites. Maybe these will push the boundaries of space technology?

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Asteroids. No corporation driven by quarterly returns will spring for that, but there is an enormous amount of raw material there. If we had a very cheap source of propulsive energy, it might be profitable to transport it back.

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