A small percentage of the dark matter in our universe might be able to interact with itself through an as yet unknown dark force, forming dark atoms and possibly even emitting dark light.
via Wired: Wired Science http://www.wired.com/wiredscience/2013/05/double-disk-dark-matter/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+wiredscience+%28Wired%3A+Blog+-+Wired+Science%29 Adam Mann
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