Hello, I have a problem with the proof provided for universe expanding. Isn't it that any observation to support the expansion is based on light. Wouldn't it be that all the observations would be exactly the same if all the galaxies were heading towards a gravitational pull? Any object would seem to move further away because the light between the points bends towards the gravitational source with higher pace than the actual distance between the two points are contracting. (Hubbles redshift would happen etc.). Even the points in same contracting line.