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Originally Posted by Digital_Trucker
How can the Drake equation confirm anything when parts of it are unknown (and possibly unknowable)?
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The point of it is to merely establish the likelihood of extraterrestrial civilizations within our own galaxy which we may come into contact with. It's really not hard to make conjectures on the subject, when all you need do is model it off our own planet.
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Originally Posted by Digital_Trucker
There may very well be other life in the universe,
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There definitely is. Just use common sense to reach that conclusion.
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Originally Posted by Digital_Trucker
but the Drake equation does nothing to confirm or deny it.
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Again, though, this is where you use common sense. Do you really think that all this:
. . .has no life in it whatsoever? There are 10,000 galaxies in that photograph alone, and it doesn't even cover a fraction of the visible sky.