> There's observational evidence for DM Um. Isn't that a contradiction in terms? By definition, DM is stuff whose existence is inferred by observations that co

> There's observational evidence for DM Um. Isn't that a contradiction in terms? By definition, DM is stuff whose existence is inferred by observations that contradict what we previously presumed to know. Hence postulate the existence of DM to close the gap between what we observe and what we "know".