…maybe.  Actually, in many way, not habitable for us, in all likelihood.

Gilese 581g orbits a red dwarf 20 light years away and is tidally locked (or close to it),which would create sharp environmental zones ranging from 160 to -30F, depending on which side of the planet you were on.  The terminator — the area of twilight on the planet — would be most livable…if you’re Eskimo or Norwegian, maybe, with a balmy -10 to 20 degree F climate.  It’s three times the size of Earth, and if the composition is right, might not have devastatingly high gravity and should be able to hold an atmosphere.

Buy your ticket now!