3 ms·

I agree underground would be the way, just to curtail radiation, which for a moon base, long-term would be a consideration.

• hga 13y ago
  As long as you can see the sun, you need that. And it's got to be thick enough to stop secondary particles, a really thin shield can be worse. The Apollo missions were timed for the part of the sun's cycle where activity was low, and I've read that their early termination was due in part to the schedule slipping and the last few planned missions edging into the period where the probability of a solar storm killing the astronauts became uncomfortably high.