Step 1 in asteroid mission: Pick right space rock
Given the currently unsolved problem of radiation in space, and the complete lack of any planning for a spacecraft big enough to accommodate a crew for the (what, one to two year?) return trip without them going stir crazy, I just can't see that a trip to an asteroid makes a sensible next step in space. At least if you go to the moon or Mars, you can get to stretch your legs in gravity at the half way point.
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