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Aliens: Yes Or No?
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<blockquote data-quote="Clint_L" data-source="post: 9083317" data-attributes="member: 7035894"><p>Evolution doesn't create life at all. Evolution by natural selection is the algorithm that describes what happens when you have a combination of replicators, competition for scarce resources, mutations, and time. But evolution is a very strong optimizer. The strongest. Though what it optimizes for is replication, not complexity. However, given the one example we have, history of life on earth, it seems that complexity is a powerful strategy for replication.</p><p></p><p>We don't know how life on earth began, though there are a number of hypotheses. However, there is nothing to indicate that earth is particularly special - even if we limit our speculation to life as we know it, the building blocks are common throughout the observable universe, and it turns out that planets are, too. And there's been plenty of time for life and subsequent evolution to happen. So it's not like the idea that life, including intelligent life, could happen somewhere else is a goofy hypothesis; to the contrary it seems like a very reasonable one. The challenge is in testing it, but again, there are already various methods to do so, with more becoming available as our technology improves.</p><p></p><p>So it makes sense to keep looking. Right now, we have recognized zero direct evidence of life elsewhere, so it would be wrong to express certainty on the issue. But expressing confidence that it exists and will likely be discovered in the future is not unscientific any more than expressing confidence, as Darwin did, that some means of passing inherited information to offspring had to exist, though he had no observations of such a thing. Still, the only rational response you can give to the question right now is an agnostic one.</p><p></p><p>At the same time, I am sympathetic to your claim that "short of "basically magic" advancements" we'll never meet another sentient species (that we didn't help create, anyway). Space is vast and hostile, and I think interstellar travel is far more daunting than we can easily comprehend. Heck, I think <em>interplanetary</em> travel is far more daunting than is popularly supposed - I am extremely doubtful that we see humans on Mars anytime in the foreseeable future, for example. And I concur that all the "visitation" mumbo jumbo has far more in common with Medieval superstition than with science.</p></blockquote><p></p>
[QUOTE="Clint_L, post: 9083317, member: 7035894"] Evolution doesn't create life at all. Evolution by natural selection is the algorithm that describes what happens when you have a combination of replicators, competition for scarce resources, mutations, and time. But evolution is a very strong optimizer. The strongest. Though what it optimizes for is replication, not complexity. However, given the one example we have, history of life on earth, it seems that complexity is a powerful strategy for replication. We don't know how life on earth began, though there are a number of hypotheses. However, there is nothing to indicate that earth is particularly special - even if we limit our speculation to life as we know it, the building blocks are common throughout the observable universe, and it turns out that planets are, too. And there's been plenty of time for life and subsequent evolution to happen. So it's not like the idea that life, including intelligent life, could happen somewhere else is a goofy hypothesis; to the contrary it seems like a very reasonable one. The challenge is in testing it, but again, there are already various methods to do so, with more becoming available as our technology improves. So it makes sense to keep looking. Right now, we have recognized zero direct evidence of life elsewhere, so it would be wrong to express certainty on the issue. But expressing confidence that it exists and will likely be discovered in the future is not unscientific any more than expressing confidence, as Darwin did, that some means of passing inherited information to offspring had to exist, though he had no observations of such a thing. Still, the only rational response you can give to the question right now is an agnostic one. At the same time, I am sympathetic to your claim that "short of "basically magic" advancements" we'll never meet another sentient species (that we didn't help create, anyway). Space is vast and hostile, and I think interstellar travel is far more daunting than we can easily comprehend. Heck, I think [I]interplanetary[/I] travel is far more daunting than is popularly supposed - I am extremely doubtful that we see humans on Mars anytime in the foreseeable future, for example. And I concur that all the "visitation" mumbo jumbo has far more in common with Medieval superstition than with science. [/QUOTE]
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