Teacher problems

[TheGoldenGriffin]

They call the stuff dark because they don't know much about the stuff. By dark matter, they are referring to the stuff thats so gravitationally attractive. They know its there, they just can't explain it yet. So for now, they call it dark matter. They are not making up stuff to make themselves correct. But they can't ignore the fact that something they can't explain is there. You're right that our theories are incomplete. Thats why dark matter and dark energy and dark flow will have to remain dark for now.