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So, since baryons are protons and neutrons, if I understand this, then 40% of the ordinary matter in the universe can be found outside of galaxies? Why can't t
by PhantomGremlin 8y ago
So, since baryons are protons and neutrons, if I understand this, then 40% of the ordinary matter in the universe can be found outside of galaxies?
Why can't that missing ordinary matter serve the same role as recent beloved explanation "dark matter" does? Or is it just too diffuse to affect things like the galaxy rotation curve?
- the8472 8y agoI guess (IANAP) that's because hydrogen is easier to observe as part of interstellar gas within a galaxy as opposed to the thinner intergalactic filaments which is also further away and doesn't get illuminated by stars or stellar remnants. So the baryonic matter in galaxies is already accounted for to a larger extent than the filaments.