nice pic.

Not much to say about the article. it is however kinda handy to have dark matter, especially aswe happen to be Mostly) sitting on a chunk of it right now while reading the comment.

A fair chunk of the dark matter may in fact be baryonic; when very cold it will not radiate. Condensation of protons by collision with spiral galaxy discs for example is what keeps spiral galaxies growing with time. Very small galaxies will be ram stripped by the same low flux of intergalactic atoms (mostly H) whern accelerated by slingshot gravitational interactions in galaxy groups.

Have a nice day: Ag