Astronomers have found an enormous hole in the Universe, nearly a billion
light-years across, empty of both normal matter such as stars, galaxies, and
gas, and the mysterious, unseen "dark matter." While earlier studies have
shown holes, or voids, in the large-scale structure of the Universe, this new
discovery dwarfs them all.
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http://www.nrao.edu/pr/2007/coldspot/
regards,CS