... Light itself, of course, has no mass (although that may be open to question; I believe that it is possible that photons have a small mass).
Einstein proved/predicted that light has mass. Proof is that light bends when it passes around massive objects (due to gravitational force). It's one of the reasons that one can see supernovas over and over again, as in [i/Groundhog Day[/i]; check out
Astronomers Watch a Supernova and See Reruns.
Banzai!
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PS
If there are any physicists out there, let's here from them!
We should probably
hear from them.
