View Full Version : Dark Matter in Distant Galaxy Groups Mapped for the First Time

2010-Feb-21, 06:20 PM
Galaxy density in the Cosmic Evolution Survey (COSMOS) field, with colors representing the redshift of the galaxies, ranging from redshift of 0.2 (blue) to 1 (red). Pink x-ray contours show the extended x-ray emission as observed by XMM-Newton.Dark matter (actually cold, dark – non-baryonic – matter) can be detected only by its gravitational influence. In [...]

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