Answer:
circle the brighter (yellow / red) areas, the are hotter, so we can expect more stars there.
the darker (blue / dark blue) areas are colder, do we expect less dense mattet/stars
since the areas are overall equal in energy density (note that the different color represent very little difference in temperature), we can expect a common origin, because regions of space so vastly apart couldn't possibly smooth out later, they would be to far apart.