Target Mars

An interesting post over at Bad Astronomy notes that it looks like Mars is still getting a regular pounding from small meteors:

The MGS team also mentioned that if you lived on Mars for about 20 years, on average you’d be close enough to one impact to actually hear it. Given that NASA plans on sending humans to Mars, this is a matter of real concern! It’s a tough problem– these are rocks that are maybe a few meters across, and so there is almost way to detect them. I have no idea how you could reliably find a large enough number of these potential impactors to do anything about them, and you really don’t want one touching down near a settlement.

I think that radiation on the surface is likely to be a problem too, given the thin atmosphere and (I think) not much of a magnetic field. It all sounds like living half underground is probably the only choice for long term settlements there. (At least until they or smash in a few comets and get a real atmosphere going.)

As I have said before, if there is some water ice on the Moon, the only big benefit of living on Mars is going to be a higher gravity, which (for permanent settlement) is probably mainly an issue for any babies conceived and raised there. We need to know the biological effect of animal gestation on the Moon before really worrying about whether Mars is worth the effort.