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  1. One of the reasons we haven’t gone back, or gone farther – perhaps the most important reason – is because it’s really, really hard. I know, I know, “we choose to [do these things], not because they are easy, but because they are hard…” But they are really, really, really hard. Going to the moon, and back – sure, we could do that again whenever we want to, really. But we’ve done that already. What would be the purpose of just doing the same thing again. No, if we’re going to do it, we need to do the NEXT thing; take the NEXT step. And that’s where the major challenges lie.

    And the biggest one of all, is simply keeping astronauts alive up there for more than just a few weeks or months. The amount of ionizing radiation astronauts are exposed to is several orders of magnitude greater than the general population. It has been estimated that astronauts on the moon are exposed to somewhere between 200-1000 times the radiation as a person at sea level on earth. Trips longer than several weeks greatly exacerbate cancer risks, and we are talking about missions to Mars that are almost certainly going to be one-way, and permanent bases established on the moon. Today we do not have anywhere close to the technology necessary to protect people for that level of exposure for that long. I think that is the single largest roadblock to long term human habitation in space.

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