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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Over great enough distances, space is expanding faster than the speed of light. This means that beyond a certain distance light will *never* reach Earth. Therefore there is a limit to how much of the universe we will ever be able to observe.
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