Mass at Light Speed: MALS Theory of the End of the Universe.
All the mass of the universe travelling at the speed of light, this is the end of the universe, but at the exact moment, the big bang.
MALS Theory envisages three rings of galaxies, for simplicity. An Inner; a Middle and an Outer set of galaxies.
The Inner galaxies traveling the slowest, while the Outer ring of galaxies traveling the fastest, in fact, approaching that of the speed of light.
As a body's velocity increases - our universe is speeding up, so its mass will increase, and therefore, the gravitational pull will also increase.
Eventually (though it is assumed time does not exist) at the outer reaches of the universe, all three rings (simplified universe) will be drawn together and when this happens, as the theory explains, the speed of light will be achieved for all the mass of the universe.