this post was submitted on 14 May 2026
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We know that's not the case because we can see different galaxies with different levels of dark matter.
Dark matter doesn't interact with anything else except by gravity, we don't know why, but we can detect that behavior by seeing the way it clumps together.
We can also see that galaxies that collide with each other have different levels of dark matter than galaxies that haven't recently done so. The dark matter appears to just pass through each other and continue on while the regular matter hits each other and stays generally together in one group.
It's pretty interesting when you work through the details of what we do and don't know.
non luminous matter is a better term, but it doesn't sound as cool and mysterious.
No we can't see that, we can see most galaxies spin faster than our models say they should and some galaxies spin a lot faster.
https://www.universetoday.com/articles/astronomers-find-a-third-galaxy-missing-its-dark-matter-validating-a-violent-cosmic-collision-theory
You don't appear to be up to date on the latest research.
Nothing in that research contradicts my comment. They found a handful of galaxies that spin as fast as models say they should, that's why i wrote "most" instead of all.
Evidence against MOND is not evidence for dark matter.