In all these infinite universes, surely there's one where there's an ice cube in the middle of the sun, since that's one possible configuration of matter.
But no! There's no story that ends with an ice-cube in the middle of the sun. There's no sequence of events that could have resulted in that so it's not in the space of possible universes.
If you teleport a block of ice to coordinates which happen to be smack dab inside a star, then maybe for an instant, like a single "tick" of the processing engine, there would be an ice cube in the middle of the sun.
One scenario I would not rule out is a large icy comet moving at large speed straight for a sun. Is there no combination of size and speed for which that would result in a small ice cube in the centre of a sun?
Going back to the sequence of events argument, I think that implies that all universes agree on similar rules like ours (Physics), as we could only deduce this kind of argument with this assumption.
Maybe there is a universe where ice is scorching hot and all sun cores consist of it, and as matter cools it evaporates? Maybe there is even a universe where gravity and orbital mechanics work in a way to produce cube shaped stellar bodies?
Could there be? This assumes that
1) different universes have different physics
2) there is at least 1 self-consistent rules of physics that allows this. I suspect that this is a harder problem.
It's fair to say that if our universe has uniform physics, then even if it is infinite, there are no solar ice-cubes anywhere in it.
> 1) different universes have different physics
Yes this is the presumption. Remember infinity allows all possible skewing of our current physics and all possible permutations of it. Further reading: https://en.wikipedia.org/wiki/Multiverse
No, it does not. Compare:
> If there are infinite numbers, and all numbers have a name, then there must exist a number with a different kind of name to the usual ones.
> If there are infinite universes, and all universes have laws of physics, then there must be universes with different laws of physics.
It's the same basic fallacy. There might universes with different physics but it does not follow from infinity.