On Sep 8, 6:51 am, Naraht wrote:
> This is more sort of a research question.
>
> Presuming a planet with more or less the same makeup of the solid
> portion, the same age, and same distance from the sun, how large or
> small can the planet be to be habitable by humans? I *think* the
> primary issue is that if it is larger than a certain size then the
> planet won't lose the Hydrogen/Helium in the atmosphere and become a
> close in Gas Giant and if it is smaller than a certain size, it won't
> keep it's Oxygen long enough (which puts the minimum somewhat larger
> than Mars (or would Mars have kept its oxygen if it had a
> Magnetosphere)).
>
> Any ideas where to look for info on this?
If you are talking about unaided humans per se,
then humans tend to black out at about 10 gs.
People would probably get bad backs more
quickly and would have to sit down a lot at
less than that.
Reasonably, if you were not talking about
a terraformed world it would probably either
1. have no oxygen, or 2. would be filled with
plants and animals that would be poisonous
to humans, anyway.
If there were worlds with free oxygen not
resulting from biological processes it
would probably be the result of relatively
strange chemistries. I would not
recommend drinking liquids on that planet. |
