[bringtheaction]

I didn’t even know that dark matter was anything more than theoretical.

[philipov]

That depends on how ready you are to dismiss the existing observational evidence for it. While it's by no means proven to exist, it's not something predicted by theory, so it's unfair to call it that. Supersymmetry, for example, is purely theoretical; whereas dark matter is a response to observations that contradict theory.