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ASTR0N0MERS originally thought that the luminous material in the sky made up all of the mass in the universe. Research has proven, however, that there is more mass present than can be accounted for by known quantities of light-emitting matter. Simulations have shown that the large-scale structure seen in the universe today is a result of the gravitational collapse of cosmological dark matter. The image shown here represents the galactic evolution over 209 million light years of dark matter and gaseous components. The large mass in the center is a central galaxy ...