Cosmic cartography

This figure shows the positions of our supervoids (blue circles) and superclusters (red circles) superimposed on the cosmic microwave background, as measured by NASA’s WMAP satellite.  The light-colored area is that covered by the SDSS galaxy survey, in which we found our structures.  At the top of the figure is the North celestial pole (near the North Star, Polaris); the cross-hairs near the middle are the North galactic pole, heading straight out along the Milky Way’s rotation axis.  The dotted curves are 30 degrees apart on the sky.

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