In article , "Paul R. Mays" writes:

"Allan Adler" wrote in message
...

At the risk of uttering complete nonsense, I'd like to describe something
I've been wondering about for a while, namely whether the density of light
in the universe might be related to the problem of dark matter and dark
energy.

If one takes all of the light in the universe, it has a certain mass


Stop......

No Mass... Light does not have mass....

A photon doesn't have a mass. A set of photons, in general, will have
mass (except when they all propagate in the same direction). The mass
of a system is not the sum of the masses of its components, in
general.

Mati Meron | "When you argue with a fool,
| chances are he is doing just the same"