I’m afraid both sets are infinite. To understand how, I recommend this video…
The jury is still out on that.
While unlikely to ultimately be allowed by the as-yet unknown laws of quantum gravity, General Relativity does permit inter-universal wormholes to form from a black hole.
See above. Most physicists are exceedingly skeptical of infinities in nature. Math is another story entirely. In my view, philosophers should be as well. Like God, infinity is a mostly a place-holder/cop-out for what we don’t really understand.
