I think even more than the energy required is the time required.. the moon is pretty close, but Mars is a huge distance away. Orders of magnitude more difficult to get to.
But yeah, the moon is pretty poor when it comes to resources.
I still think we should be sending up robots to mine asteroids, there's far more to be had resource wise from asteroids than there is on the moon. EDIT: Or we could put those resources into orbit, use them to build a Mars mission without having to heavy lift everything up there.
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Uncertainty is an uncomfortable position.
But certainty is an absurd one.
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