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Quite simply what it is? If it's some type of subatomic particle, then what are the various properties (mass, spin, etc) of that particle and where does it fit into the standard model? Perhaps it's not a particle? We don't know. If not, what's causing the anomaly in galactic rotation and what accounts for all that lensing?
As Feynman said, simply calling it a name (i.e. Dark Matter) doesn't answer anything. The name 'Dark Matter' is just a placeholder what something we don't know. Same as Dark Energy.
Permalink Thu, 13 Oct 2011 01:34:57 UTC | #880347