[DBrow]

You mean a universe without photons? Well, since we’re making this up as we go here, I think that a photonless universe would still have mass. The question is does a baryonic universe require photons, and I think it might be OK, but Genesis suggests otherwise (no light, no anything).

Certainly you could not observe much in a universe without photons.

[The Cajun]

Certainly you could not observe much in a universe without photons.

Might be a little nippy to.

[brytlea]

I cot completely lost when someone was explaining string theory and it dawned on me that we were just energy anyway. Suddenly anything and nothing seemed equally likely. Being rather math challenged is really a very BIG disability!

[Colinsky]

You mean a universe without photons? Well, since we’re making this up as we go here, I think that a photonless universe would still have mass. The question is does a baryonic universe require photons, and I think it might be OK, but Genesis suggests otherwise (no light, no anything).
Certainly you could not observe much in a universe without photons.

In the beginning there was nothing.
And God said, "Let there be light."
And there still was nothing, but now you could see it.