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Originally Posted by Robert A.
However, there is not enough of this matter (not to mention it is baryonic, and the evidence - abundances of deuterium and Lithium-7 - is that most dark matter is nonbaryonic) to account for the rotation curves we see in spiral and elliptical galaxies.
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Unfortunately, the standard collisionless CDM has
problems . It is helpful to remember that the notion that the DM
must be non-baryonic is not a direct observational result, but rather the result of plugging observations into the standard model. Those observations are telling us that either the DM is non-baryonic or the standard model needs adjustment. Both options must be kept open.
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After all that, the bottom line is that the largest component of dark matter - the nonbaryonic flavor - has not been detected.
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Not yet. Certainly the coupling of visible and dark matter suggests the proposed non-baryonic candidates may not have the right properties.
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I, for one, am glad that there are major mysteries in astronomy. If we really did know it all, there would be no surprises, and it would get boring mighty fast.
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Ditto