[StanislavPetrov]

Its not the name "dark matter" have an objection too, its misleading and/or confused attitudes like the one you yourself exhibit in your comment!

> We know there's something out of ordinary, it behaves like matter, and it doesn't interact with light

That's wrong, and presupposes the existence of dark matter, rather than treating it as a possibility. What we know is that our formulas don't match up with our observations. We don't know why that is. One suggestion is that there is some sort of invisible stuff out there that we cannot detect, but would make our formulas add up, so it could exist. Its perfectly legitimate to speculate about the existence of dark matter, and to set up different experiments to try to detect it, but its not fine to pretend that its "settled science" that dark matter is out there and its only a matter of finding it. Unless and until someone detects "dark matter" or figures out another reason why our calculations don't add up its existence will remain an open question.

[svachalek]

Years ago, vaguely describing it as “formulas not adding up” would have been fair enough but there are quite a few studies now giving a much more detailed picture than that. Some galaxies seem to have quite a lot of it, some galaxies not much at all, so it’s harder and harder to just tweak formulas for the visible matter in a way that explains all the evidence.