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- Nemesis_(hypothetical_star) abstract "Nemesis is a hypothetical red dwarf star or brown dwarf, originally postulated in 1984 to be orbiting the Sun at a distance of about 95,000 AU (1.5 light-years), somewhat beyond the Oort cloud, to explain a perceived cycle of mass extinctions in the geological record, which seem to occur more often at intervals of 26 million years. As of 2012, over 1800 brown dwarfs have been identified and none of them are inside the Solar System. There are actually fewer brown dwarfs in our cosmic neighborhood than previously thought. Rather than one star for every brown dwarf, there may be as many as six stars for every brown dwarf.More recent theories suggest that other forces, like close passings of other stars, or the angular effect of the galactic gravity plane working against the outer solar orbital plane, may be the cause of orbital perturbations of some outer Solar System objects. In 2011, Coryn Bailer-Jones did an analysis of craters on the surface of the Earth and reached the conclusion that the earlier findings of simple periodic patterns (implying periodic comet showers dislodged by a hypothetical Nemesis star) to be statistical artifacts, and found that the crater record shows no evidence for Nemesis. However, in 2010, A.L. Melott and R.K. Bambach found evidence in the fossil record confirming the extinction event periodicity originally claimed by Raup & Sepkoski in 1984, but at a higher confidence level and over a time period nearly twice as long. The Infrared Astronomical Satellite (IRAS) failed to discover Nemesis in the 1980s. The 2MASS astronomical survey, which ran from 1997 to 2001, failed to detect an additional star or brown dwarf in the Solar System.Using newer and more powerful infrared telescope technology, able to detect brown dwarfs as cool as 150 kelvins out to a distance of 10 light-years from the Sun, results from the Wide-field Infrared Survey Explorer (WISE survey) have not detected Nemesis. In 2011, David Morrison, a senior scientist at NASA known for his work in risk assessment of near Earth objects, has written that there is no confidence in the existence of an object like Nemesis, since it should have been detected in infrared sky surveys.".
- Nemesis_(hypothetical_star) wikiPageExternalLink lbl-nem.htm.
- Nemesis_(hypothetical_star) wikiPageExternalLink Lunar_impacts_Nemesis.pdf.
- Nemesis_(hypothetical_star) wikiPageExternalLink acta.
- Nemesis_(hypothetical_star) wikiPageExternalLink 0104251.
- Nemesis_(hypothetical_star) wikiPageExternalLink 0002255.
- Nemesis_(hypothetical_star) wikiPageExternalLink getting-wise-about-nemesis.
- Nemesis_(hypothetical_star) wikiPageExternalLink nemsis_myth?filter_order=L.
- Nemesis_(hypothetical_star) wikiPageExternalLink nemesis_010320-1.html.
- Nemesis_(hypothetical_star) wikiPageExternalLink Evidence_Mounts_For_Companion_Star_To_Our_Sun.html.
- Nemesis_(hypothetical_star) wikiPageExternalLink watch?v=ERy-MTfgulc.
- Nemesis_(hypothetical_star) wikiPageID "89344".
- Nemesis_(hypothetical_star) wikiPageRevisionID "604294939".
- Nemesis_(hypothetical_star) colwidth "30".
- Nemesis_(hypothetical_star) hasPhotoCollection Nemesis_(hypothetical_star).
- Nemesis_(hypothetical_star) subject Category:Brown_dwarfs.
- Nemesis_(hypothetical_star) subject Category:Extinction_events.
- Nemesis_(hypothetical_star) subject Category:Hypothetical_bodies_of_the_Solar_System.
- Nemesis_(hypothetical_star) subject Category:Hypothetical_stars.
- Nemesis_(hypothetical_star) subject Category:Hypothetical_trans-Neptunian_objects.
- Nemesis_(hypothetical_star) subject Category:M-type_main-sequence_stars.
- Nemesis_(hypothetical_star) subject Category:Oort_cloud.
- Nemesis_(hypothetical_star) subject Category:Solar_System_dynamic_theories.
- Nemesis_(hypothetical_star) subject Category:Theories.
- Nemesis_(hypothetical_star) type Abstraction100002137.
- Nemesis_(hypothetical_star) type Cognition100023271.
- Nemesis_(hypothetical_star) type Event100029378.
- Nemesis_(hypothetical_star) type Explanation105793000.
- Nemesis_(hypothetical_star) type ExtinctionEvents.
- Nemesis_(hypothetical_star) type HigherCognitiveProcess105770664.
- Nemesis_(hypothetical_star) type Process105701363.
- Nemesis_(hypothetical_star) type PsychologicalFeature100023100.
- Nemesis_(hypothetical_star) type SolarSystemDynamicTheories.
- Nemesis_(hypothetical_star) type Theories.
- Nemesis_(hypothetical_star) type Theory105989479.
- Nemesis_(hypothetical_star) type Thinking105770926.
- Nemesis_(hypothetical_star) type YagoPermanentlyLocatedEntity.
- Nemesis_(hypothetical_star) comment "Nemesis is a hypothetical red dwarf star or brown dwarf, originally postulated in 1984 to be orbiting the Sun at a distance of about 95,000 AU (1.5 light-years), somewhat beyond the Oort cloud, to explain a perceived cycle of mass extinctions in the geological record, which seem to occur more often at intervals of 26 million years. As of 2012, over 1800 brown dwarfs have been identified and none of them are inside the Solar System.".
- Nemesis_(hypothetical_star) label "Hipótesis Némesis".
- Nemesis_(hypothetical_star) label "Nemesis (Stern)".
- Nemesis_(hypothetical_star) label "Nemesis (astronomia)".
- Nemesis_(hypothetical_star) label "Nemesis (astronomia)".
- Nemesis_(hypothetical_star) label "Nemesis (hypothetical star)".
- Nemesis_(hypothetical_star) label "Nemesis (ster)".
- Nemesis_(hypothetical_star) label "Némésis (étoile hypothétique)".
- Nemesis_(hypothetical_star) label "Nêmesis (astronomia)".
- Nemesis_(hypothetical_star) label "Немезида (звезда)".
- Nemesis_(hypothetical_star) label "ネメシス (恒星)".
- Nemesis_(hypothetical_star) label "涅墨西斯星".
- Nemesis_(hypothetical_star) sameAs Nemesis_(Stern).
- Nemesis_(hypothetical_star) sameAs Νέμεσις_(αστέρας).
- Nemesis_(hypothetical_star) sameAs Hipótesis_Némesis.
- Nemesis_(hypothetical_star) sameAs Nemesis_hipotesia.
- Nemesis_(hypothetical_star) sameAs Némésis_(étoile_hypothétique).
- Nemesis_(hypothetical_star) sameAs Hipotesis_Nemesis.
- Nemesis_(hypothetical_star) sameAs Nemesis_(astronomia).
- Nemesis_(hypothetical_star) sameAs ネメシス_(恒星).
- Nemesis_(hypothetical_star) sameAs 네메시스_(항성).
- Nemesis_(hypothetical_star) sameAs Nemesis_(ster).
- Nemesis_(hypothetical_star) sameAs Nemesis_(astronomia).
- Nemesis_(hypothetical_star) sameAs Nêmesis_(astronomia).
- Nemesis_(hypothetical_star) sameAs m.0m9hk.
- Nemesis_(hypothetical_star) sameAs Q308803.
- Nemesis_(hypothetical_star) sameAs Q308803.
- Nemesis_(hypothetical_star) sameAs Nemesis_(hypothetical_star).
- Nemesis_(hypothetical_star) wasDerivedFrom Nemesis_(hypothetical_star)?oldid=604294939.
- Nemesis_(hypothetical_star) isPrimaryTopicOf Nemesis_(hypothetical_star).