If most dark matter is usually relegated to the relatively uninfluential 85 percent, we could then think of the newly proposed type of dark matter as an upwardly mobile middle class—with interactions mimicking those of familiar matter. The additional interactions would affect the makeup of the galaxy and allow this portion of dark matter to affect the motion of stars and other objects in the domain of ordinary matter.
Matter might have a spectrum of darkness -- oh, crap, we're going to end up discussing extra dimensions, aren't we?
