[Hemi-Cuda]

Originally Posted by troutman

I wonder if there are very many worlds where humans could live without life support. We are finely tuned to exist in Earth's environment. Even small differences could be fatal to us.

http://en.wikipedia.org/wiki/Space_c...n#Life_support

http://en.wikipedia.org/wiki/Class_M_planet

http://en.wikipedia.org/wiki/Habitable_zone

http://en.wikipedia.org/wiki/Planetary_habitability

as long as the planet is in the "goldilocks" zone and has liquid water, that would still be far better than Mars. wearing a breather mask to go outside would be a lot better than having to don a full spacesuit