I was reading this article about the theory of galactic bubbles (excuse my simplistic terminology)
[https://www.vice.com/en_in/article/4agbjn/we-actually-live-inside-a-huge-bubble-in-space-physicist-proposes](https://www.vice.com/en_in/article/4agbjn/we-actually-live-inside-a-huge-bubble-in-space-physicist-proposes)
I feel like I get it if I expel my understanding of space as a vacuum, but I was hoping someone here could explain to me how different regions of space could have different densities if, to my understanding, space is an absence of matter (totally ready to hear this understanding is wrong).
In: Physics
Space has ~2 particles per cubic meter, it’s not a total absence of things. I think the easiest way to understand would be to think about nebulae, which are only visible because a large group of stars has the particles attracted into one spot and the light makes it visible. There’s a lot of stuff in space that we just can’t see because it’s dark, but in a nebula? It practically glows. TL;DR, space isn’t empty it just has a lot of dark stuff and gravity can concentrate that dark stuff.
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