eli5: if we cant observe all of the universe how do we know its infinite?
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“infinite” is a pretty open ended concept. Nothing is a pretty impossible concept. If you got to the edge of the universe and there was nothing there what would you see? The problem is, you can’t really have nothing. An empty box has air in it – an empty box in space still has the vaccuum in it. The empty space isn’t “nothing,.”
Unfortunately, infinite also has it’s problems. Trying to wrap our minds around this has brought up ideas of “recursive” space (Spaceis a 4d sphere, or you get to one “edge” and it connects to the “far” edge). It could aslo be that our universe is an atom making up part of a larger universe that is part of an atom in our universe (that gets confusing and I never understood how the physics work).
Then there are much more complicated mathematical and physics models that have to do with repeating numbers extending outwards.
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