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answers:
Brigalow Bloke say: Prove that you cannot speak Mongolian first.
2,300 or more years ago Aristotle and others knew that you can't prove a negative without a physical search (if possible), do try to keep up.
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say: First you prove that you posted this question on yahoo answers not on answers.yahoo.com
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Newdivide1701 say: The only way to prove aliens don't exist is to look at literally EVERY single square metre of the entire universe and NOT see a thing. Every planet, every moon, every comet, meteor, asteroid, anything that can theoretically harbour life.
And by the time we reach Europa we will have confirmation of extraterrestrial life. Hell with the presence of methane on Mars says it might not be a dead world after all since one method of generating methane is through biological processes.
Look out the window, don't see any aliens, and thus concluding there are no aliens is extremely unscientific.
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mars say: I can't prove that they don't. The atomic oxygen in space, and the great distance between systems suggest aliens couldn't travel here by our understanding. The Bible notes that God has 'other children' indicating there may be more humanoid-like life-forms.
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poldi say: Very simple logic says you cannot prove a negative. So no one can prove they do not exist.
But since there is no proof aliens exist, rational people choose to be skeptical.
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say: You can't prove that they do or do not
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tham153 say: negatives cannot be proved, long standing philosophical rule
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Mutt say: Prove that they do!
Neither of us can prove one way or the other.
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quantumclaustrophobe say: I can't prove they don't exist.
I can't prove they do exist.
Right now, all anyone has is opinion and conjecture.
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