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Originally posted by Link:
IMHO it's absolutely not silly or arrogant to think we're the only ones in the universe. Why would we think otherwise? There hasn't been a single clue of life existing outside of Earth. And that's what scientists do: they state something, and that hypothesis is held until somebody proves it false.
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Not quite. Scientists state a reasonable hypothesis, test it and hold it to be true until it fails a test. Statisticaly, it is more likely that a number of intelligent species exist in the universe than that only one such species exists. Therefore extraterrestrial intelligence is not only a valid hypothesis, but its is a reasonable and generaly accepted hypothesis.
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Why is one and one two? Not because it simply is the way it is, but because we haven't proven yet that it's not true, so we agreed on that matter with each other. Same goes for life existing elsewhere. Until discovered, it's not there. In my honest opinion of course.
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1+1=2 because they are defined that way. They have no natural existence. They are concepts used by humans to represent numerical information.
As far as life existing elsewhere, if it exists it exists. If we havent discovered it yet, it still exists. The odds on us ever discovering extraterrestrial life are minimal, but I am confident it exists.