I have come across the idea of possible worlds in high school and my first year of undergrad studies.
Assuming that the concept of possible worlds or possibility is useful for philosophical analysis, how do we actually establish whether something is possible?
Aside from examining what we see in our actual world, and claiming these things are possible, how can we jump and make the claim that things we have never seen before are possible?
I know some people used conceivability as a guide to possibility, but is this a good one? It seems that there is no way to verify that our process of claiming that world's are possible is correct, as we have very little data to work with (only 1 actual world Vs infinite possible worlds).