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Originally Posted by pan6467
Ah, but SETI has found some non-"natural" sounds.
Plus SETI can only "see" so far and only "looks" for what we know.
If there are other, more intelligent civilizations out there, how do we know they haven't tried to communicate but we lack the technology to "hear" them?
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I'm not aware of anything SETI has found where natural causes have been ruled out. Do you have a reference?
I've spoken with SETI, and contrary to what most people would think, there're not just looking for alien sports broadcasts. There main focus is bursts of radio energy that are by-products of major industrial activity.
If there are alien civilizations nearby then their techology is pre-industrial (there's no reason to say they don't exist, because we have no way of detecting them, plus the latest observations show that planets ARE common), or they don't use radio for communications at all (I can't imagine that) and their industry prodices no radio signals (again, hard to imagine).
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Again, I believe the universe is teeming with life and it is very self serving to believe we are it, or the most intelligent or the only ones that know how to communicate.
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That is a belief, but the facts needed to prove or disprove it are simply not available.
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If there are aliens and they can get here and are superior in technology, they could easily block out what signals there are in space.
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Proposing that aliens have the technology to evaporate radio signals hat have alread been emitted, without evaporating natural radio signals is a BIG leap. This is even more far-fetched than creationists who claim the the Earth is 6,000 years old and that light & radio signals that suggest a billion-years-old universe were created by God en-route in order to test our faith.