Dark matter is a big clue that for all of our discoveries and progress we are mostly still in the dark about the nature of the universe. In terms of our understanding, we are at the same level as cave scientists Ook and Groog. Dark matter is not even in our current mathematical or physical models of the universe. There is a large amount of stuff out there silently pulling on us, and we don’t know what it is. We can’t possibly claim to understand our universe without understanding this huge part of it.
