Did life come about because of a confluence of circumstances unique to Earth or can it develop and thrive with a fairly broad set of conditions?
That's the fundamental question, because there are a variety of conditions on Earth that are relatively unique. But did live develop here specifically because of those conditions or was it only shaped because of them? I mean, if you examine life everything fits just right but what we have is a chicken and egg scenario.
Keep in mind that if life were as resilient and adaptable that we should be finding evidence of it surviving elsewhere within our own solar system. So far we haven't found anything which would imply that specific conditions are required. But how specific are the requirements. Earth isn't tidal locked, we've got a large satellite and a fairly stable star, plate tectonics, amongst countless other things. So who knows what the real odds are. I will concede, however, that it's far from being too late to find something on a neighboring planet.
I do like being optimistic about this, however, so I want to believe that life should be common. However, given the vastness of the universe "common" is an extremely relative term. What are the odds of finding complex multi-cellular life within a distance we can realistically travel? And what are the odds of finding life that is thriving within our time frame. Chances are that most life gets snuffed out long before it's able to evolve into anything noteworthy.
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