Does nonbaryonic dark matter exist?

[Tyger]

People have "invented" it out of a need to explain large scale motions in the Universe, but is it really there? Might there be other explanations?

Here's an interesting page about it.

http://www.astro.ucla.edu/~agm/darkmtr.html

You can get more by putting "dark matter" into Google or MSN. Does what you know about it convince you that all the possibilites have been explored?

 

[LURCH]

Neutrinos have already been detected. As for how much nonbaryonic dark matter exists, I haven't a clue.