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What about the whole asteroid thing? If the asteroid doesn't happen for 1000 years, then I think we could safely say that weaponry and space transport technology would have progressed to the point where it would be a trivial matter for any passing space-freighter to blow it out of the sky. It's only if it happens in the next 50-100 years that it would be a problem that would need the sort of bankroll that only governments have.
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