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CoolGrey6
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I've been reading some books on Galactic Structures and Galactic Evolutions, evidence from rotation curves of stars near the centre of our Milky Way and also M31 suggest that there is a black hole in the centre. But is this true for all galaxies regardless of their Hubble Type? is there a galaxy that does not have a black hole at its centre?? What type of evidences beside rotation curves suggest that there is a black hole?? X-ray emissions from its accretio disk?