Velocity dispersions Dark matter

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stars in bound systems must obey virial theorem. theorem, measured velocity distribution, can used measure mass distribution in bound system, such elliptical galaxies or globular clusters. exceptions, velocity dispersion estimates of elliptical galaxies not match predicted velocity dispersion observed mass distribution, assuming complicated distributions of stellar orbits.


as galaxy rotation curves, obvious way resolve discrepancy postulate existence of non-luminous matter.








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