But new observations suggest that dark matter interacts significantly with itself, while leaving regular matter out of the conversation. (newscientist.com)
Furthermore, computer simulations of the universe have largely reproduced the cosmos we see today by following a recipe of roughly 5 parts dark matter to 1 part regular matter. (discovermagazine.com)
Aside from its gravitational tug on regular matter, the stuff is proving tough to detect. (newscientist.com)