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Astronomers report today that they have found intriguing evidence that a black hole weighing over 2.6 billion times the mass of the Sun exists at the center of the giant elliptical galaxy M87, based upon images taken by NASA's Hubble Space Telescope (HST). The images show that stars become strongly concentrated towards the center of M87, as if drawn into the center and held there by the gravitational field of a massive black hole.