Bauran wrote:
If you broaden it further to encompass the entire planet we have billions of different species of animal, plant, insect, virus, bacteria, etc. etc. that exist on this one planet and as far as we know doesn't, hasn't, and may never happen again on any other planet.
While we do not have a particularly large sample pool yet, the evidence simply does not support this claim.
Space is big, planets are small, and living things are smaller still. We've only been able to detect planets outside our solar system for about a decade, and low-mass earth-like planets for only a few years. We have no way as yet to detect life remotely beyond the wishful thinking of SETI, so we must rely on samples (from probes or meteorites) to find it.
Because of this, right now we have of sample space of roughly two, fairly different, objects: Earth and Mars (the only thing they have in common is roughly similar composition). One we know for a fact has life on it; the other may have, based on current evidence, had life on it once. To say, in the light of this, that life "as far as we know doesn't, hasn't, and may never happen again on any other planet" strikes me as sheer folly.
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What has happened, and what continue to happen though is people will try to come up with some sort of explanation, something to lean on to make them feel like they weren't some sort of accident. Something that gives them meaning, hope (to sound overly sappy), I guess is the word for it.
And what, pray tell, is wrong with being an "accident"? What says our lives have to be given meaning, rather than creating it for ourselves?
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All that said I STILL think that it's an awfully large mathematical impossibility that all things aligned to have even ONE living creature come to fruition in lieu of the fact no other planet has such success in doing so. I mean everything has to be a-number-1-perfect. But all the life we have here? NO outside influences? I don't know.
And what are the odds that one specific sperm fertilized one specific egg to give you the specific genome you now possess? It doesn't matter. The odds of something happening don't matter much once it has happened.
And even the rarest events can become near certainties with enough attempts. The odds of rolling all sixes on 10 six-sided dice is roughly 1 in 60 million, but if I roll those dice one billion times, I'd get on average 16 or 17 all-sixes.
Our galaxy is 12.4 billion years old, it contains over 200 billion stars and has a total mass in excess of 500 billion solar masses, representing roughly 7x10^68 atoms; the number of potential molecular collisions that could result in a self-replicating molecule is so astronomically large that it dwarfs the low probability that such a collision actually results in said molecule. And that's just in our galaxy, which is itself just one of hundreds of billions.
On a universal scale, human intuitions about "rare" simply have no meaning.