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Dark matter
Physical cosmology Universe · Big Bang Age of the universe Timeline of the Big Bang Ultimate fate of the universe Inflation · Nucleosynthesis GWB · Neutrino background Cosmic microwave background Redshift · Hubble's law Metric expansion of space Friedmann equations FLRW metric Shape of the universe Structure formation Reionization Galaxy formation Large-scale structure Galaxy filament Lambda-CDM model Dark energy · Dark matter Dark fluid · Dark flow Timeline of cosmological theories Future of an expanding universe Observational cosmology 2dF · SDSS COBE · BOOMERanG · WMAP · Planck v d e This article needs attention from an expert on the subject. See the talk page for details. WikiProject Physics or the Physics Portal may be able to help recruit an expert. (September 2011) Estimated distribution of dark matter and dark energy in the universe In astronomy and cosmology, dark matter is matter that neither emits nor scatters light or other electromagnetic radiation, and so cannot be directly detected via optical or radio astronomy. Dark matter is believed to constitute 83% of the matter in the universe and 23% of the mass-energy.Dark matter was postulated by Fritz Zwicky in 1934 to account for evidence of "missing mass" in the orbital velocities of galaxies in clusters. Subsequently, other observations have indicated the presence of dark matter in the universe; these observations include the rotational speeds of galaxies, gravitational lensing of background objects by galaxy clusters such as the Bullet Cluster, and the temperature distribution of hot gas in galaxies and clusters of galaxies. Though the existence of dark matter is generally accepted by the mainstream scientific community, some alternative theories to explain the anomalies that dark matter is intended to solve have been proposed. Cite error: There are tags on this page, but the references will not show without a {{Reflist}} template or a tag; see the help page.
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