this post was submitted on 07 Nov 2025
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We don't know if space is a material made of anything, but we treat space as a 4-dimensional coordinate set in our math. We know space is expanding because when we look at things far away, 100% of them are moving away from us, and the farther away they are, the faster they're moving. Some clever people did the math and established that the only reasonable cause for that is space itself expanding, so things that are further away move away faster because there's more space between us to expand.
We also don't know (and very possibly can't know) if there are discrete units of what we consider "space" to be or if it is a continuum