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- Dark_matter abstract "Dark matter is a type of matter hypothesized in astronomy and cosmology to account for effects that appear to be the result of mass where no such mass can be seen. Dark matter cannot be seen directly with telescopes; evidently it neither emits nor absorbs light or other electromagnetic radiation at any significant level. It is otherwise hypothesized to simply be matter that is not reactant to light. Instead, the existence and properties of dark matter are inferred from its gravitational effects on visible matter, radiation, and the large-scale structure of the universe. According to the Planck mission team, and based on the standard model of cosmology, the total mass–energy of the known universe contains 4.9% ordinary matter, 26.8% dark matter and 68.3% dark energy. Thus, dark matter is estimated to constitute 84.5% of the total matter in the universe, while dark energy plus dark matter constitute 95.1% of the total content of the universe.Astrophysicists hypothesized dark matter because of discrepancies between the mass of large astronomical objects determined from their gravitational effects and the mass calculated from the "luminous matter" they contain: stars, gas, and dust. It was first postulated by Jan Oort in 1932 to account for the orbital velocities of stars in the Milky Way and by Fritz Zwicky in 1933 to account for evidence of "missing mass" in the orbital velocities of galaxies in clusters. Subsequently, many other observations have indicated the presence of dark matter in the universe, including the rotational speeds of galaxies by Vera Rubin in the 1960s–1970s, gravitational lensing of background objects by galaxy clusters such as the Bullet Cluster, the temperature distribution of hot gas in galaxies and clusters of galaxies, and more recently the pattern of anisotropies in the cosmic microwave background. According to consensus among cosmologists, dark matter is composed primarily of a not yet characterized type of subatomic particle.The search for this particle, by a variety of means, is one of the major efforts in particle physics today.Although the existence of dark matter is generally accepted by the mainstream scientific community, some alternative theories of gravity have been proposed, such as MOND and TeVeS, which try to account for the anomalous observations without requiring additional matter.".
- Dark_matter thumbnail 080998_Universe_Content_240_after_Planck.jpg?width=300.
- Dark_matter wikiPageExternalLink index.php?option=com_content&task=view&id=113&Itemid=108.
- Dark_matter wikiPageExternalLink darkmatter.asp.
- Dark_matter wikiPageExternalLink the-fifth-element.
- Dark_matter wikiPageExternalLink www.aspera-eu.org.
- Dark_matter wikiPageExternalLink what-dark-matter.
- Dark_matter wikiPageExternalLink dark-matter-detected.
- Dark_matter wikiPageExternalLink www.hap-astroparticle.org.
- Dark_matter wikiPageExternalLink article.ns?id=dn7056.
- Dark_matter wikiPageExternalLink 100613212708.htm.
- Dark_matter wikiPageExternalLink the-dark-matter-crisis.
- Dark_matter wikiPageID "8651".
- Dark_matter wikiPageRevisionID "606406952".
- Dark_matter hasPhotoCollection Dark_matter.
- Dark_matter subject Category:Astroparticle_physics.
- Dark_matter subject Category:Celestial_mechanics.
- Dark_matter subject Category:Dark_matter.
- Dark_matter subject Category:Darkness.
- Dark_matter subject Category:Exotic_matter.
- Dark_matter subject Category:Large-scale_structure_of_the_cosmos.
- Dark_matter subject Category:Physical_cosmology.
- Dark_matter subject Category:Physics_beyond_the_Standard_Model.
- Dark_matter subject Category:Theoretical_physics.
- Dark_matter subject Category:Unsolved_problems_in_astronomy.
- Dark_matter subject Category:Unsolved_problems_in_physics.
- Dark_matter comment "Dark matter is a type of matter hypothesized in astronomy and cosmology to account for effects that appear to be the result of mass where no such mass can be seen. Dark matter cannot be seen directly with telescopes; evidently it neither emits nor absorbs light or other electromagnetic radiation at any significant level. It is otherwise hypothesized to simply be matter that is not reactant to light.".
- Dark_matter label "Ciemna materia".
- Dark_matter label "Dark matter".
- Dark_matter label "Donkere materie".
- Dark_matter label "Dunkle Materie".
- Dark_matter label "Materia oscura".
- Dark_matter label "Materia oscura".
- Dark_matter label "Matière noire".
- Dark_matter label "Matéria escura".
- Dark_matter label "Тёмная материя".
- Dark_matter label "مادة مظلمة".
- Dark_matter label "暗物质".
- Dark_matter label "暗黒物質".
- Dark_matter sameAs Temná_hmota.
- Dark_matter sameAs Dunkle_Materie.
- Dark_matter sameAs Σκοτεινή_ύλη.
- Dark_matter sameAs Materia_oscura.
- Dark_matter sameAs Materia_ilun.
- Dark_matter sameAs Matière_noire.
- Dark_matter sameAs Materi_gelap.
- Dark_matter sameAs Materia_oscura.
- Dark_matter sameAs 暗黒物質.
- Dark_matter sameAs 암흑물질.
- Dark_matter sameAs Donkere_materie.
- Dark_matter sameAs Ciemna_materia.
- Dark_matter sameAs Matéria_escura.
- Dark_matter sameAs m.02dl6.
- Dark_matter sameAs Q79925.
- Dark_matter sameAs Q79925.
- Dark_matter wasDerivedFrom Dark_matter?oldid=606406952.
- Dark_matter depiction 080998_Universe_Content_240_after_Planck.jpg.
- Dark_matter isPrimaryTopicOf Dark_matter.
