Cosmology Primer: Galaxy Map

A map of the galaxy distribution in one slice of the sky, from the Sloan Digital Sky Survey. Different colors indicate different kinds of galaxies. We are located at the bottom vertex of the cone. Although there is obviously a rich structure of voids and filaments, the overall distribution approaches uniformity on large scales. The distribution thins out far away from us, simply because galaxies become fainter and harder to find; the true distribution is approximately uniform.

Click on the image for full resolution.