True, we cannot determine the scenario. > but we haven't observed life emerging from non-life But our laboratory is very, very small, so that proves little.

True, we cannot determine the scenario. > but we haven't observed life emerging from non-life But our laboratory is very, very small, so that proves little. And we know life emerged at least once, and it doesn't seem particularly improbable. That's what I mean by "not magic"; not that we understand every little step, but we have some idea. I don't think it's scifi to believe it's unlikely only Earth has sparked life. The one thing that is unlikely is that we will ever witness life anywhere else, but that's a different problem.