I found a quick (read one post) explanation of Dark Matter and Dark Energy on reddit from a cosmology PhD: http://www.reddit.com/r/Physics/comments...e_current/
Also, Diamond, what have your esteemed colleagues to say about The Bullet Cluster? REF: http://en.wikipedia.org/wiki/Bullet_Cluster
conclusion of referenced post Wrote:So, while the dark matter name sounds mysterious and is often termed a place holder for stuff we don't know about, we do in fact, know an awful lot about the properties of dark matter and have finitely many models and theories waiting to be confirmed or disproven from the LHC and DM direct detection experiments.
Also, Diamond, what have your esteemed colleagues to say about The Bullet Cluster? REF: http://en.wikipedia.org/wiki/Bullet_Cluster