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
It’s not something that can easily be ELI5’d, because even the experts only have theories. Dark matter or “anti-matter”, mass that has the opposite effect of gravity (when things pull together), is still largely unexplored, because we have never witnessed it, only witnessed the effects of it.
Think, if you will, of theorising the existence of a bear in the woods, purely by seeing its tracks and its poop, but never being able to see the bear itself.
This is the way we know about Dark Matter.
It seems to have the opposite properties of regular mass. In this way, think of the two ends of a magnet. We know a lot about the end that pulls, that’s where we get our knowledge of gravity from, but there’s this whole opposing force that pushes, that we’ve barely touched upon in research.
I’m by no means an expert, but I’m fascinated by all this stuff, so I’ve read/watched a lot about it. I’ve always got more to learn though (as do we all!) so I’m very passionate in talking about it!
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