reply to post by swolleneyeball
Wow, did you get some
answers to your question!
Here are a few practical ones.
Apart from being in the habitable zone, rocky, watery and generally earthlike, your habitable planet would need to have a good strong magnetic field
like Earth's, to divert nasty high-energy particles from space that would otherwise fry anything living on the planet's surface.
A rotational period of around 24 hours would be nice, though perhaps not essential.
You might, perhaps, be able to terraform an unfriendly atmosphere, doing what plants and blue-green algae do as well as 'cracking' oxides in the
crust and releasing the oxygen. I don't see how this could be done significantly faster than nature manages it - but it probably can.
Plenty of nitrogen or another fairly inactive gas in the atmosphere would also be necessary to stop all that oxygen from burning up everything on the
If you're planning to eat the local fauna and flora then you'd be hoping the local life-forms are not only carbon-based but involves left-handed
amino acids and right-handed sugers. Chirality
If you're planning to take tomatoes and rice and chicken along, then you'd want soils composed of the correct minerals - no, wait, it's harder than
that. You'd need soil
, which is a very special substance manufactured by earthworms. Hmm... hydroponics. But you'd still need to find the
right minerals available locally.
One could go on and on, really. There's a list of requirements as long as your arm.
I'm sure there are habitable 'new Earths' out there - it's a big universe - but if there are, they've probably already evolved their own
intelligent lifeforms, who may object violently if we descend from the heavens and try to take thier planet away from them.
In the end, and probably for the foreseeable future, I reckon this is the only world we've got. I honestly wish I could say different.