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Nature 401, 27-28 (2 September 1999) | doi:10.1038/43336
Dark matter: Lumpy haloes spin faster
James Binney
More than 90% of the mass of the Universe is thought to be made up of dark matter. The density of this mysterious matter has been most precisely measured in the outer reaches of disk-shaped spiral galaxies, where very little light is emitted by stars.
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