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Astronomers have found a distant galaxy where there is no dark matter.Yale University astronomer Pieter van Dokkum and colleagues spied a vast, old galaxy with relatively few stars where what you see truly is what you get.Van Dokkum studies diffuse galaxies, ones that cover enormous areas but have relatively few stars.Then they used larger telescopes on Hawaii and eventually the Hubble Space Telescope to study the galaxy.Even though the galaxy is mostly empty, they found clusters of densely grouped stars. A galaxy with so few stars should have more dark matter than others, not none.One outsider suggested that perhaps the "galaxy" Van Dokkum studied is so diffuse that it may not really be a galaxy.There's no good explanation for why and how this galaxy has no dark matter, Van Dokkum said.
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