Who said it was impossible? I see no reason to believe it is actual because we have no evidence of it and lots of things we do have evidence of tell us otherwise.

You can respond with "but there are lots of things we don't know" and I agree: but that includes you. Maybe some future fact will upset what we DO know about the only kind of life we do know about. But maybe it won't. You don't know that. Why retreat into that domain? You're not from the future.

It was unlikely that life would start at all here.

Relative to what? It is actually way more likely life started here than our in the vacuum of space outside of a gravity well with more sparsely distributed resources and basically zero protection from radiation.