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The rotation curves of spiral galaxies appear to be roughly flat out to the outermost observed points, which is in contrast to the nearly Keplerian decline expected from the luminous disc (see e.g. Rubin, Ford & Thonnard 1980 and Sancisi 1999 and references therein). This discrepancy has led to the conclusion that spiral galaxies are dominated by a massive dark halo which has a different nature from the luminous matter.
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