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

Everything is getting further apart.

Imagine you and some friends meet up in a circle in the center of a football field. Then each of you takes a step back, then another. The size of your circle is increasing with every step (eventually it will be the entire football field), but no new friends have been created. You’re just all getting further apart.

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