“dark matter” is one of the biggest joke/frauds played on the rest of the grant suckers.
I am not sure I would call it a fraud. I predict that ultimately the scientists will say that there is no dark matter, and that their previous belief that dark matter exists was the result of a misunderstanding of the basic laws of physics. However, so far no one has put up dark matter as an excuse to spend trillions of dollars re-engineering society. That’s global warming.
Did you ever see that old Calvin and Hobbes cartoon where Calvin makes fun of it? “Why do they call it dark matter? Because it’s dark? Duh! That’s the best name they could come up with? A duh!”
If dark matter existed you’d be shoveling it off your driveway in June.