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My own perspective is, given the current estimates of what proportion of stars are likely to have planets, and what proportion of panets are likely to provide conditions suitable for live as we can conceive of it (I think it would be a mistake to only consider "earthlike" planets as candidates for life) and given how many galaxies have been observed by the likes of the Hubble scope. I think it is almost inconceivable that this is the only place in the universe where life has come about. Will we ever have undeniable proof that Earth is the only place where ther is life? I doubt it. Will we ever prove that there is no other life in the universe? No, that is a position that could only ever be disproved, not proven!
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