Yes, from our reference frame the universe has a mass of 10 to the 53rd KG, but light in the Geometric Universe is not really, in an ultimate cosmic sense, in motion either.

Light is a condition or matrix from which we are made, and in which we are embedded. Neither the light emanating source nor the observer moves. We perceive movement in 4-D, because at our dimensional level, we observe only cross-sections of time- we do not view our whole existence at once.

Since the cross sections we observe progressively are different, we interpret what we see as "motion" and "Change". It's like living on "flatland" and not being able to comprehend a sphere, only circles of changing size, as the sphere passes through our "reality".

Mass as we understand it, and I want to stress that, becomes infinite at the speed of light, and the concept of "mass" cannot be understood from that frame, which is of course, dimensionally different.

From our frame, we can experimentally determine that the electromagnetic matrix is NOT actually infinite in mass, though it is vast.

Every time we turn on a light bulb, we accelerate matter to the speed of light. At least we add enough energy to orbiting photon spheres to free some photons, which we then see and use to illuminate the room.

I have a section in my site about relativistic effects...they are interesting. The photon and momentum in GR are linked concepts,(Dave Butterfield in Colorado Springs is very interested in this. I don't have details, but he links momentum in GR with Doppler effects.) I only can firmly state on the basis of experiment that photons and momentum in GR exist and form the foundation of our reality.

Regards, Sam Cox