Quote:
Originally Posted by ChiliConCarnage
I'm not sure why they need to find planets Humans could have survived on. Life finds a way under bizarre circumstances. Even Humans as they exist are only around due to ancestors surviving hard to imagine catastrophes.
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A lot of it really comes down to water. Everything we know about life suggests that H2O is necessary for it to work (reacting with carbon), so at a minimum you need a planet that is somewhere between 32F and 212F.
It's theoretically possible for life to be built in a very different way (silicon is a possibility in place of carbon), but we don't even know what we'd be looking for to try and find something like that.