Interesting, I didn’t know that! I guess for me the analogy is to the sphere in flatland being perceived as a circle - we can see evidence of dark matter but s

Interesting, I didn’t know that! I guess for me the analogy is to the sphere in flatland being perceived as a circle - we can see evidence of dark matter but so far we can’t really detect or measure it directly. I wonder if the gravitational effect is the only clue that we’ll find inside “normal” spacetime. The most exciting thing about that is the idea that the hunt for dark matter might eventually lead to an understanding of the “rest of the universe” where we would otherwise never have a hint of its existence.