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Mark _australia said..That is bloody hilarious. We all came from the big bang but there just can't be life on a planet that does not have water.

Surely you can see the incongruity of making statements like that.
BTW plenty of evolutionary types who are into their alien theorising, talk about silicon based life. Why not waterless?
I am not belittling ANY scientific discovery/ies at all nor whinging about cost. I just suggest that this is not a particularly earth shattering discovery. I can't think of one single way it changes our lives here on earth apart from it increasing the chance there was once bacteria on Mars. And even then, it could have been covered with water for a million years, yet
still had no life all on it. That is just as likely isn't it?
Well,
more likely that it didn't have life
What you're asking about is actually the origins of life, not evolution per se.
It is possible that life can arise without liquid water, but we don't know how. We DO know about life and liquid water, so the odds are just better that we go investigating where there are dribbles.
Life (so far) is carbon-based because carbon is a whore. Chemistry again, which others can answer better than me. Silicon is a possibility but the chemistry is tougher, making it less likely.
It's already changed your life -- wouldn't be posting in here without it, eh
It's likely that we are the only life in the entire universe, but given that life burst forth here in such abundance and such different climates, odds are very good that we're not. If we don't find life on Mars, or Europa, it doesn't mean much -- given the odds.