CDM

--- Cold Dark Matter :-)

The universe is supposed to consist of dark matters that
can't be observed directly but through their
gravitational force on the motions of galaxies, stars
and those "visible" matters. The ratio between dark
matter and visible matter is at least 10.

Why is it called "cold" ? Yes, there is a "hot" dark
matter which actually was proposed before the "cold"
ones. For instance, if one of the neutrino types has
finish mass, (usually, neutrino has no mass, just like
light--photons) the universe would be controled by
the "hot" dark matter. But "hot" matters prodict too few
galaxies and stars than what observed. So the only
posible candidate is cold.

Up to several years ago before I left the field, all
cosmological observations are in consistent with the
cold dark matter hypothesis.

Have fun!

Peter Bi

>     In response to "lurkerdom" present or in the future, before any other
> sleepy-eyed Fafnirs stick the head out of their lairs breathing the fires
of
> exegesis permit me to wield my pen in self-defense, parry my parody, and
> deprecate my doggerel.
>
>     The land's at its spring
>     And day's at the mourn;
>     No one's a novice;
>     This List's no fun;
>     The flag's on its wing;
>     The snailmail's got porn;
>     Greenspan's in office
>     Tennyson, anyone?
>
> CDM