The Rotation of Spiral Galaxies

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Science  24 Jun 1983:
Vol. 220, Issue 4604, pp. 1339-1344
DOI: 10.1126/science.220.4604.1339


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.