eli5 How does/can space expand?

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eli5 How does/can space expand?

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We don’t really know.

Observationally we can see that it does, but the underlying mechanism has remained a mystery. Whatever energy is driving the expansion is undetectable through any known means.

[This is a great overview of the expansion of the universe](https://youtu.be/9DrBQg_n2Uo)

I also recommend PBS Spacetime, Sabine Hossenfelder, Arvin Ash, and Cool worlds. They all cover physics topics very well even if you don’t have a strong math background.