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Articles
The Rotation of Spiral Galaxies
1 Staff member of the Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, D.C. 20015, and an adjunct staff member of the Mount Wilson and Las Campanas Observatories
There is accumulating evidence that as much as 90 percent of the mass of the universe is nonluminous and is clumped, halo-like, around individual galaxies. The gravitational force of this dark matter is presumed to be responsible for the high rotational velocities of stars and gas in the disks of spiral galaxie. At present, the form of the dark matter is unknown. Possible candidates span a range in mass of 1070, from non-zero-mass neutrinos to massive black holes.
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Science. ISSN 0036-8075 (print), 1095-9203 (online)