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In August of 2007, astronomers at the University of Minnesota located a gigantic hole in the universe. This empty space, stretching nearly a billion light-years across, is devoid of any matter such as galaxies, stars, and gas, and neither does it contain the strange and mysterious dark matter, which can be detected but not seen. Empty places in the universe are not uncommon. It is already known that matter tends to clump and form stars and galaxies, clusters and superclusters, due to the pulling force of gravity.