Dark matter

The distribution of dark matter in a cluster of galaxies.
Image: Max-Planck Institute for Astrophysics
Dark matter refers to non-luminous matter particles whose presence is suggested because of the gravitational effects on the rotation rate of visible matter such galaxies and the presence of clusters of galaxies.
Introduction First observational evidences The galactic rotation problem
Dark matter within galaxies Dark matter between galaxies Dark matter Composition
Baryonic Nonbaryonic Neutrino WIMP String theory
Updated 24th July 2007

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