The observable universe. Does it mean the edge of space where nothing else is? Is it where the universe is currently at in its expansion after the big bang? Or is it just a barrier that our telescopes are yet to look beyond, and there are just more galaxies past it?
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It’s the universe we’re causally connected to. That’s just a fancy way of saying it’s the part we can ever see, the part that can interact with us in some way, the part that can be be reached at or below the speed of light. Everything beyond that sphere isn’t just something we can’t see, it’s utterly disconnected from us and us from it. We’ll never see it, never reach it, and can have no effect on it even trillions of years from now (unless the expansion of space reverses of course).
The observable universe is *probably* a very small part of a much much MUCH larger universe, which in turn may or may not be infinite.
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