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- Oort_cloud abstract "The Oort cloud (/ˈɔrt/ or /ˈʊərt/; named after the Dutch astronomer Jan Oort), or Öpik–Oort cloud, is a spherical cloud of predominantly icy planetesimals that is believed to surround the Sun at a distance up to 50,000 AU, nearly a light-year. This places the cloud at nearly a quarter of the distance to Proxima Centauri, the nearest star to the Sun. The Kuiper belt and the scattered disc, the other two reservoirs of trans-Neptunian objects, are less than one thousandth of the Oort cloud's distance. The outer limit of the Oort cloud defines the cosmographical boundary of the Solar System and the region of the Sun's gravitational dominance.The Oort cloud is thought to comprise two separate regions: a spherical outer Oort cloud and a disc-shaped inner Oort cloud, or Hills cloud. Objects in the Oort cloud are largely composed of ices, such as water, ammonia, and methane.Astronomers argue that the matter composing the Oort cloud formed closer to the Sun and was scattered far out into space by the gravitational effects of the giant planets early in the Solar System's evolution. Although no confirmed direct observations of the Oort cloud have been made, astronomers argue that it is the source of all long-period and Halley-type comets entering the inner Solar System and many of the centaurs and Jupiter-family comets as well. The outer Oort cloud is only loosely bound to the Solar System, and thus is easily affected by the gravitational pull both of passing stars and of the Milky Way itself. These forces occasionally dislodge comets from their orbits within the cloud and send them towards the inner Solar System. Based on their orbits, most of the short-period comets may come from the scattered disc, but some may still have originated from the Oort cloud.".
- Oort_cloud thumbnail Kuiper_oort.jpg?width=300.
- Oort_cloud wikiPageExternalLink 1994QJRAS..35....1M.
- Oort_cloud wikiPageExternalLink solarsystem.nasa.gov.
- Oort_cloud wikiPageExternalLink profile.cfm?Object=KBOs.
- Oort_cloud wikiPageExternalLink kboc.html.
- Oort_cloud wikiPageID "22385".
- Oort_cloud wikiPageRevisionID "606275115".
- Oort_cloud colwidth "30".
- Oort_cloud hasPhotoCollection Oort_cloud.
- Oort_cloud subject Category:Astronomical_hypotheses.
- Oort_cloud subject Category:Comets.
- Oort_cloud subject Category:Discoveries_by_Jan_Oort.
- Oort_cloud subject Category:Hypothetical_trans-Neptunian_objects.
- Oort_cloud subject Category:Objects_within_10_ly_of_Earth.
- Oort_cloud subject Category:Oort_cloud.
- Oort_cloud subject Category:Trans-Neptunian_region.
- Oort_cloud type Abstraction100002137.
- Oort_cloud type Act100030358.
- Oort_cloud type DiscoveriesByJanOort.
- Oort_cloud type Discovery100043195.
- Oort_cloud type Event100029378.
- Oort_cloud type PsychologicalFeature100023100.
- Oort_cloud type YagoPermanentlyLocatedEntity.
- Oort_cloud comment "The Oort cloud (/ˈɔrt/ or /ˈʊərt/; named after the Dutch astronomer Jan Oort), or Öpik–Oort cloud, is a spherical cloud of predominantly icy planetesimals that is believed to surround the Sun at a distance up to 50,000 AU, nearly a light-year. This places the cloud at nearly a quarter of the distance to Proxima Centauri, the nearest star to the Sun.".
- Oort_cloud label "Nuage d'Oort".
- Oort_cloud label "Nube de Oort".
- Oort_cloud label "Nube di Oort".
- Oort_cloud label "Nuvem de Oort".
- Oort_cloud label "Obłok Oorta".
- Oort_cloud label "Oort cloud".
- Oort_cloud label "Oortsche Wolke".
- Oort_cloud label "Oortwolk".
- Oort_cloud label "Облако Оорта".
- Oort_cloud label "سحابة أورط".
- Oort_cloud label "オールトの雲".
- Oort_cloud label "奥尔特云".
- Oort_cloud sameAs Oortův_oblak.
- Oort_cloud sameAs Oortsche_Wolke.
- Oort_cloud sameAs Νέφος_του_Όορτ.
- Oort_cloud sameAs Nube_de_Oort.
- Oort_cloud sameAs Oorten_hodeia.
- Oort_cloud sameAs Nuage_d'Oort.
- Oort_cloud sameAs Awan_Oort.
- Oort_cloud sameAs Nube_di_Oort.
- Oort_cloud sameAs オールトの雲.
- Oort_cloud sameAs 오르트_구름.
- Oort_cloud sameAs Oortwolk.
- Oort_cloud sameAs Obłok_Oorta.
- Oort_cloud sameAs Nuvem_de_Oort.
- Oort_cloud sameAs m.05lvs.
- Oort_cloud sameAs Mx4rvZcnHJwpEbGdrcN5Y29ycA.
- Oort_cloud sameAs Q40864.
- Oort_cloud sameAs Q40864.
- Oort_cloud sameAs Oort_cloud.
- Oort_cloud wasDerivedFrom Oort_cloud?oldid=606275115.
- Oort_cloud depiction Kuiper_oort.jpg.
- Oort_cloud isPrimaryTopicOf Oort_cloud.
