eli5 If matter cannot be destroyed or created, how does space constantly expand?

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Maybe I’m misinformed about this. But I was always told matter cannot be destroyed or created. But I have been told space is constantly expanding. Is this expansion of space not made up of “matter”? Where does it come from?

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Anonymous 0 Comments

There is actually a recent theory that uses some very complicated maths to re-examine what we have seen and states that the universe isn’t actually expanding, we are just seeing what is as far as I understood particles becoming old. So we may assume they are actually moving away from us when it’s could be that they are just different from particles much closer to us.

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