Empty Hole in Universe Discovered

Illustration of the effect of intervening matter in the cosmos on the
cosmic microwave background (CMB). On the right, the CMB is released
shortly after the Big Bang, with tiny ripples in temperature due to
fluctuations in the early Universe. As this radiation traverses the
Universe, filled with a web of galaxies, clusters, superclusters and voids,
it experiences slight perturbations. In the direction of the giant
newly-discovered void, the WMAP satellite (top left) sees a cold spot,
while the VLA (bottom left) sees fewer radio galaxies.

CREDIT: Bill Saxton, NRAO/AUI/NSF, NASA