As the universe expands we know the distances between objects is getting larger. The exact machinations of this process, however, are still unknown. An analogy often used is that it is similar to the surface of a balloon; the rubber of the balloon isn’t really expanding from a central point but it is all expanding equally. As this happens, in the balloon analogy there isn’t any extra rubber being created but rather it is just getting thinner.
This could be how it works in space but we are not sure. Nothing suggests that new ‘space’ or material is being created as space expands but we know that ‘space’ is expanding. We also know that everywhere is expanding at the same rate, as such there is
no discernible centre of the known universe, and the exact mechanics of this expansion are still the subject of a lot or research.
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