Over in print media today,
New Scientist's cover article was on a "new" idea for what dark matter is. Apparently, dark matter should be composed of Dark Atoms, in a theory introduced by
Christopher Wells, et al. In fact, astronomers and particle physicists have been studying many ideas of what dark matter could be for quite a while. Occasionally a summary of the current ideas gets published, such a the 2004 classic, by
Silk, even then half the current ideas get left out, such as CHAMP, mirror matter, Q-balls, super weak dark matter and many others.