I am still offering 200BTC for any proof of aliens. And that is the tip of the iceburg, "the amazing Randy" also has 1 million dollars ready to give away. Funny how the aliens only reveal themselves to weirdos who can't seem to muster a shred of evidence. Just bring me a tool made from an unknown alloy or a single sample of a non-DNA based lifeform. Because it would be the greatest discovery in all of science, I would gladly pay.
It's probable alien life exists.
It's not probable they have visited earth.
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It would surprise me if life only existed on Earth. But there is zero scientific evidence of any kind of visitation.
@j603 I teach biology and am very failure with the "Martian Bacteria". Among scientist this is not even close to proving anything. The strongest statement that can be made it that one can not prove these structures are not bacteria. But make no mistake, life has never been found anywhere other than Earth. so far.