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The title is a bit misleading - this is not some density property of space-time, but more simply the density of electrons in space (average number of electrons/cubic cm).

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That's what I thought the title meant (electron density).

I thought it was spacetime, so the clarification certainly helped me!

Exactly where I got confused when only reading the title. After reading the article to realize it’s about the density of matter.

But what a concept though, how can a space-time be denser than any other? I’m not versed in this, maybe it can?

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