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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Because the speed of light is finite, and the universe is only 13.8 billion years old, light from further away than 13.8 billion light-years needs more time than the universe has been around to make it to us, so we can’t see it!
This is very simplified and doesn’t take into account the expansion of the universe. Expansion makes our “observable” universe much larger. But it should give you an idea of what we mean when we say “observable universe”
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