University of Minnesota 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, as well as 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.
http://www1.umn.edu/umnnews/news_detail ... 56&page=NS
Here two pdf files:
http://xxx.lanl.gov/PS_cache/arxiv/pdf/ ... 0908v2.pdf
and one with pictures
http://www.ftpi.umn.edu/dsu07/talks/Col ... fM_DSU.pdf