Astronomers discover third galaxy lacking dark matter, challenging the assumption that dark matter is an invisible glue needed to hold galaxies together - AOS for Lemmy.World - A generic Lemmy server for everyone to use.

Unless, hear me out here,

There's this theory that there's no such thing as Dark Matter; but rather, billions of free floating miniature black holes just wandering the cosmos as leftovers from the big bang.

What if the galaxies lacking "dark matter" are the ones where Type 3 civilizations have worked to capture, contain, and harness all these rogue black holes, especially if they may pose a threat to interstellar travel.

Source on the black holes - https://youtu.be/Q6QJFCGLJW8

Note that it's always good to keep in mind that "dark matter" is a scientific hypothesis at best, and really just a placeholder for trying to quantify some form of mass / effect that can't be directly observed.

I love the black hole angle, though, especially as a bit of a Kurzgesagt fan.
Indeed, this one is probably the most fascinating hypotheses I've ever heard when it comes to cosmology:

This Black Hole Could be Bigger Than The Universe

https://www.youtube.com/watch?v=71eUes30gwc

(raise your hand and wave it around if you're cool with living inside a black hole!)

What if there is such a thing as dark matter, and galaxies lacking it are the ones where Type 3 civilizations burnt it all up for energy?

Van Dokum at it again?