Ian Lynch wrote:
Bit like neutrinos. ISTR that neutrinos have a mean free path of 144 light years in iron so they are pretty difficult to detect but they do have a notional mass. I think the calcs showed that neutrinos couldn't be responsible for dark matter. Probably something in wikipedia about it if I could be bothered to look it up :-)
No, neutrinos can't account for dark matter. Then again, we don't know of anything that can except for things that we don't know exist - e.g. undiscovered fundamental particles, interactions with a parallel universe (yes, some people have theorized this, I saw a seminar about Brane Theory that touched on the subject).
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