Reply #11: Or even acknowledging the enormous range of environmental conditions...

[TheMadMonk]

...we manage to quite comfortably live in.

I suspect given a suitable partial pressure of oxygen and no toxins we would be able to "move right in" anywhere between 0.5g and 2g surface gravity, the same -50 to +50 C temperature range, and pretty much any diurnal cycle at all. Though the last would probably require a certain amount of environmental "insulation" and perhaps medical regulation at the extremes.

However, as we are beginning to learn, there is in fact a certain "Lamarkian" influence to genetics, so anything between a 16 and 30 odd hour day is almiost certainly within the limits of human adaptability over surprisingly few generations. And that adaptability should also extend to gravity, temperature, insolation/UV, even background radiation.

Of course there will be numerous long term health issues for the first generation of colonists, they will almost certainly all die young and early infant mortality won't be a pretty thing. But if we ever find a There to get to and invent a way to get us There, we WILL go, we WILL move in, and we WILL almost certainly prove to be a "bit of a bother" to the local generae far more often than the reverse.