The question of whether there is life elsewhere in the Universe depends on what you think of abiogenesis. It's a somewhat popular view that since life appeared here on Earth it must have had a fairly decent chance of appearing.
Problem is we know nothing about whether the origin of life is normal or whackily improbable. We know nothing about the odds of self-replicating molecules appearing. It seems that all life on earth is related enough that abiogenesis appeared only once on Earth.
It might that the odds are extremely high (1 in 10 planets) or it might be that they are vanishingly small (1 in *number of planets in universe*. Sample size is pretty small. 1 known case. We know nothing.
If you come across a really strange object in the jungle, what are the odds you'll find another one? Not a clue with the information we have. Speculating that you found it in the forest you happen to be in and calculating how many other forests there are "just like it" won't help.
Fletch pointed out the ignorance of man and that we have no reason to think we are alone in the Universe. I think we are even more ignorant than he does. We don't have a clue.
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