Gliese 581g has 3x the mass of earth, those are going to be some muscley aliens... Not sure I'd want to be the first guy to say hello!
All kidding aside, I think an important factor with finding "life" is as much the "when" as the "if". It is quite possible we arrive at a planet too early or too late to encounter much in the way of lifeforms. The whole concept is amazing to me though..
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