As they announced at the meeting in San Diego, the Sloan survey team was able to pick up such a density peak at a distance of 500m light years.

ECONOMIST: Astronomy

And that geometrical prediction was confirmed directly by the Sloan survey, using the known distances of 500m light years to the density peak and 13 billion light years to the region where the microwave background originates as reference points to look for geometrical distortion, in the way that a more traditional land survey might use triangulation points.

ECONOMIST: Astronomy

Demographic information such as median income and population density are from the U.S. Census Bureau's most recent ZIP code survey.

FORBES: Magazine Article