Of course this is probably not the case, but for the interest of the point of view, at x magnitude of gravity, in a fixed point how far could a photon travel before being bent back to its point of origin. Perhaps also to not think of it like a ball going up and down, gravity could bend that light around in a circle, so even if the point of origin moved through space, the gravity could be bending light back around and in the direction of our observation point, so would appear to be ahead of us in the direction we are traveling through the universe.. Also to explain the millions of point sources (stars and galaxies).. the light would only come back as a diffuse glow if a reflective boundary was uniform, if there was a boundary to the universal bubble that was pointed like a tesseract, the observation would be different, with light being focused at points.