Ennesby: We knwo dark matter exists because it does interact with regular matter. The interaction is purely gravitational. Dark matter is what makes galaxies spin faster than they would if only their visible mass is present.
Tagon: So you're saying it's possible that our unseen enemy is made out of dark matter?
Ennesby: No...
Tagon: Oh, that's a relief.
Ennesby: I'm saying it's probable.