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Nemesis (hypothetical star)

Index Nemesis (hypothetical star)

Nemesis is a hypothetical red dwarf 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. [1]

78 relations: Adrian Melott, Apparent magnitude, Ariel (The Tempest), Artifact (error), Astronomer, Astronomical survey, Astronomical unit, Barnard's Star, Binary star, Binary system, Black Moon Clan, Brown dwarf, Business Insider, Comet, Cretaceous–Paleogene extinction event, David M. Raup, David Morrison (astrophysicist), Destiny (video game), Douglas Vakoch, Eocene–Oligocene extinction event, Extinction event, Fossil, Giant-impact hypothesis, History of Earth, Hydra (constellation), Hypothesis, Hypothetical astronomical object, Impact event, Invertebrate, IRAS, J. Davy Kirkpatrick, Jack Sepkoski, Kelvin, Large Synoptic Survey Telescope, Leuschner Observatory, Light-year, List of Sailor Moon R episodes, Malmquist bias, Marc Davis (astronomer), Michael E. Brown, Nature (journal), Nemesis (Asimov novel), Oil & Gold, Oort cloud, Orbital eccentricity, Paleontology, Pan-STARRS, Parallax, Perihelion and aphelion, Perturbation (astronomy), ..., Piet Hut, Planet Nine, Planets beyond Neptune, Proper motion, Protozoa, Red dwarf, Richard A. Muller, Sailor Moon, Saturn, Semi-major and semi-minor axes, Shiva Hypothesis, Shriekback, Star catalogue, Substellar object, Sun, The Astrophysical Journal, The Librarians (2014 TV series), Theia (planet), Time series, Trans-Neptunian object, Tyche (hypothetical planet), University of California, Berkeley, Vertebrate, Vulcan (hypothetical planet), Wide-field Infrared Survey Explorer, X-ray, 2MASS, 90377 Sedna. Expand index (28 more) »

Adrian Melott

Adrian Lewis Melott (born January 7, 1947) is an American physicist.

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Apparent magnitude

The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.

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Ariel (The Tempest)

Ariel is a spirit who appears in William Shakespeare's play The Tempest.

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Artifact (error)

In natural science and signal processing, an artifact is any error in the perception or representation of any information, introduced by the involved equipment or technique(s).

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Astronomer

An astronomer is a scientist in the field of astronomy who concentrates their studies on a specific question or field outside the scope of Earth.

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Astronomical survey

An astronomical survey is a general map or image of a region of the sky which lacks a specific observational target.

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Astronomical unit

The astronomical unit (symbol: au, ua, or AU) is a unit of length, roughly the distance from Earth to the Sun.

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Barnard's Star

Barnard's Star is a very-low-mass red dwarf about 6 light-years away from Earth in the constellation of Ophiuchus.

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Binary star

A binary star is a star system consisting of two stars orbiting around their common barycenter.

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Binary system

A binary system is a system of two astronomical bodies which are close enough that their gravitational attraction causes them to orbit each other around a barycenter (also see animated examples).

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Black Moon Clan

The is a group of fictional characters who serve as villains in the Sailor Moon manga series by Naoko Takeuchi.

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Brown dwarf

Brown dwarfs are substellar objects that occupy the mass range between the heaviest gas giant planets and the lightest stars, having masses between approximately 13 to 75–80 times that of Jupiter, or approximately to about.

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Business Insider

Business Insider is an American financial and business news website that also operates international editions in the UK, Australia, China, Germany, France, South Africa, India, Italy, Indonesia, Japan, Malaysia, Netherlands, Nordics, Poland, Spanish and Singapore.

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Comet

A comet is an icy small Solar System body that, when passing close to the Sun, warms and begins to release gases, a process called outgassing.

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Cretaceous–Paleogene extinction event

The Cretaceous–Paleogene (K–Pg) extinction event, also known as the Cretaceous–Tertiary (K–T) extinction, was a sudden mass extinction of some three-quarters of the plant and animal species on Earth, approximately 66 million years ago.

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David M. Raup

David M. Raup (April 24, 1933 – July 9, 2015) was a University of Chicago paleontologist.

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David Morrison (astrophysicist)

David Morrison (born 26 June 1940) is an American astronomer, a senior scientist at the Solar System Exploration Research Virtual Institute, at NASA Ames Research Center in Mountain View, California.

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Destiny (video game)

Destiny is an online-only multiplayer first-person shooter video game developed by Bungie and published by Activision.

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Douglas Vakoch

Douglas Vakoch (born June 16, 1961) is an American search for extraterrestrial intelligence (SETI) researcher, psychologist, and president of METI (Messaging Extraterrestrial Intelligence), a nonprofit research and educational organization devoted to transmitting intentional signals to extraterrestrial civilizations.

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Eocene–Oligocene extinction event

The transition between the end of the Eocene and the beginning of the Oligocene is marked by large-scale extinction and floral and faunal turnover (although minor in comparison to the largest mass extinctions).

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Extinction event

An extinction event (also known as a mass extinction or biotic crisis) is a widespread and rapid decrease in the biodiversity on Earth.

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Fossil

A fossil (from Classical Latin fossilis; literally, "obtained by digging") is any preserved remains, impression, or trace of any once-living thing from a past geological age.

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Giant-impact hypothesis

The giant-impact hypothesis, sometimes called the Big Splash, or the Theia Impact suggests that the Moon formed out of the debris left over from a collision between Earth and an astronomical body the size of Mars, approximately 4.5 billion years ago, in the Hadean eon; about 20 to 100 million years after the solar system coalesced.

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History of Earth

The history of Earth concerns the development of planet Earth from its formation to the present day.

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Hydra (constellation)

Hydra is the largest of the 88 modern constellations, measuring 1303 square degrees.

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Hypothesis

A hypothesis (plural hypotheses) is a proposed explanation for a phenomenon.

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Hypothetical astronomical object

A hypothetical astronomical object is an astronomical object (such as a star, planet or moon) that is believed or speculated to exist or to have existed but whose existence has not been scientifically proven.

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Impact event

An impact event is a collision between astronomical objects causing measurable effects.

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Invertebrate

Invertebrates are animals that neither possess nor develop a vertebral column (commonly known as a backbone or spine), derived from the notochord.

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IRAS

The Infrared Astronomical Satellite (IRAS) was the first-ever space telescope to perform a survey of the entire night sky at infrared wavelengths.

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J. Davy Kirkpatrick

J.

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Jack Sepkoski

Joseph John Sepkoski Jr. (July 26, 1948 – May 1, 1999) was a University of Chicago paleontologist.

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Kelvin

The Kelvin scale is an absolute thermodynamic temperature scale using as its null point absolute zero, the temperature at which all thermal motion ceases in the classical description of thermodynamics.

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Large Synoptic Survey Telescope

The Large Synoptic Survey Telescope (LSST) is a wide-field survey reflecting telescope with an 8.4-meter primary mirror, currently under construction, that will photograph the entire available sky every few nights.

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Leuschner Observatory

Leuschner Observatory, originally called the Students' Observatory, is an observatory jointly operated by the University of California, Berkeley and San Francisco State University.

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Light-year

The light-year is a unit of length used to express astronomical distances and measures about 9.5 trillion kilometres or 5.9 trillion miles.

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List of Sailor Moon R episodes

The second season of the Sailor Moon anime series, titled, was produced by Toei Animation and directed by Junichi Sato and Kunihiko Ikuhara.

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Malmquist bias

The Malmquist bias is an effect in observational astronomy which leads to the preferential detection of intrinsically bright objects.

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Marc Davis (astronomer)

Marc Davis (born 1947) is an American Professor of Astronomy and Physics at the University of California, Berkeley.

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Michael E. Brown

Michael E. Brown (born June 5, 1965) is an American astronomer, who has been professor of planetary astronomy at the California Institute of Technology (Caltech) since 2003.

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Nature (journal)

Nature is a British multidisciplinary scientific journal, first published on 4 November 1869.

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Nemesis (Asimov novel)

Nemesis is a science fiction novel by American writer Isaac Asimov.

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Oil & Gold

Oil & Gold, the third full-length Shriekback studio album, is widely considered the band's highest moment.

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Oort cloud

The Oort cloud, named after the Dutch astronomer Jan Oort, sometimes called the Öpik–Oort cloud, is a theoretical cloud of predominantly icy planetesimals proposed to surround the Sun at distances ranging from.

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Orbital eccentricity

The orbital eccentricity of an astronomical object is a parameter that determines the amount by which its orbit around another body deviates from a perfect circle.

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Paleontology

Paleontology or palaeontology is the scientific study of life that existed prior to, and sometimes including, the start of the Holocene Epoch (roughly 11,700 years before present).

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Pan-STARRS

The Panoramic Survey Telescope and Rapid Response System (Pan-STARRS 1; obs. code: F51 and Pan-STARRS 2 obs. code: F52) located at Haleakala Observatory, Hawaii, USA, consists of astronomical cameras, telescopes and a computing facility that is surveying the sky for moving or variable objects on a continual basis, and also producing accurate astrometry and photometry of already detected objects.

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Parallax

Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.

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Perihelion and aphelion

The perihelion of any orbit of a celestial body about the Sun is the point where the body comes nearest to the Sun.

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Perturbation (astronomy)

In astronomy, perturbation is the complex motion of a massive body subject to forces other than the gravitational attraction of a single other massive body.

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Piet Hut

Piet Hut (born September 26, 1952) is a Dutch-American astrophysicist, who divides his time between research in computer simulations of dense stellar systems and broadly interdisciplinary collaborations, ranging from other fields in natural science to computer science, cognitive psychology and philosophy.

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Planet Nine

Planet Nine is a hypothetical planet in the outer region of the Solar System.

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Planets beyond Neptune

Following the discovery of the planet Neptune in 1846, there was considerable speculation that another planet might exist beyond its orbit.

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Proper motion

Proper motion is the astronomical measure of the observed changes in the apparent places of stars or other celestial objects in the sky, as seen from the center of mass of the Solar System, compared to the abstract background of the more distant stars.

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Protozoa

Protozoa (also protozoan, plural protozoans) is an informal term for single-celled eukaryotes, either free-living or parasitic, which feed on organic matter such as other microorganisms or organic tissues and debris.

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Red dwarf

A red dwarf (or M dwarf) is a small and relatively cool star on the main sequence, of M spectral type.

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Richard A. Muller

Richard A. Muller (born January 6, 1944) is an American physicist and professor of physics at the University of California, Berkeley.

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Sailor Moon

is a Japanese ''shōjo'' manga series by Naoko Takeuchi.

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Saturn

Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter.

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Semi-major and semi-minor axes

In geometry, the major axis of an ellipse is its longest diameter: a line segment that runs through the center and both foci, with ends at the widest points of the perimeter.

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Shiva Hypothesis

William Napier (astronomer) and Victor Clube in their 1979 Nature Magazine article, 'A Theory of Terrestrial Catastrophism', proposed the idea that gravitational disturbances caused by the Solar System crossing the plane of the Milky Way galaxy are enough to disturb comets in the Oort cloud surrounding the Solar System.

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Shriekback

Shriekback are an English rock band formed in 1981 in Kentish Town by Barry Andrews, formerly of XTC and League of Gentlemen (keyboards/synthesizers/vocals), and Dave Allen, formerly of the Gang of Four (bass), with Carl Marsh, formerly of Out On Blue Six (guitars/vocals) soon added to the line-up.

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Star catalogue

A star catalogue (Commonwealth English) or star catalog (American English), is an astronomical catalogue that lists stars.

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Substellar object

A substellar object, sometimes called a substar, is an astronomical object whose mass is smaller than the smallest mass at which hydrogen fusion can be sustained (approximately 0.08 solar masses).

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Sun

The Sun is the star at the center of the Solar System.

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The Astrophysical Journal

The Astrophysical Journal, often abbreviated ApJ (pronounced "ap jay") in references and speech, is a peer-reviewed scientific journal of astrophysics and astronomy, established in 1895 by American astronomers George Ellery Hale and James Edward Keeler.

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The Librarians (2014 TV series)

The Librarians is an American fantasy-adventure television series developed by John Rogers and broadcast on TNT, which premiered on December 7, 2014.

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Theia (planet)

Theia is a hypothesized ancient planetary-mass object in the early Solar System that, according to the giant impact hypothesis, collided with another planetary-mass object, Gaia (the early Earth) around 4.5 billion years ago.

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Time series

A time series is a series of data points indexed (or listed or graphed) in time order.

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Trans-Neptunian object

A trans-Neptunian object (TNO, also written transneptunian object) is any minor planet in the Solar System that orbits the Sun at a greater average distance (semi-major axis) than Neptune, 30 astronomical units (AU).

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Tyche (hypothetical planet)

Tyche is a hypothetical gas giant located in the Solar System's Oort cloud, first proposed in 1999 by astrophysicists John Matese, Patrick Whitman and Daniel Whitmire of the University of Louisiana at Lafayette.

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University of California, Berkeley

The University of California, Berkeley (UC Berkeley, Berkeley, Cal, or California) is a public research university in Berkeley, California.

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Vertebrate

Vertebrates comprise all species of animals within the subphylum Vertebrata (chordates with backbones).

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Vulcan (hypothetical planet)

Vulcan is a small hypothetical planet that was proposed to exist in an orbit between Mercury and the Sun.

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Wide-field Infrared Survey Explorer

Wide-field Infrared Survey Explorer (WISE) is a NASA infrared-wavelength astronomical space telescope launched in December 2009, and placed in hibernation in February 2011.

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X-ray

X-rays make up X-radiation, a form of electromagnetic radiation.

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2MASS

The Two Micron All-Sky Survey, or 2MASS, was an astronomical survey of the whole sky in the infrared spectrum and one of the most ambitious such projects.

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90377 Sedna

90377 Sedna is a large minor planet in the outer reaches of the Solar System that was,, at a distance of about 86 astronomical units (AU) from the Sun, about three times as far as Neptune.

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Redirects here:

Death star hypothesis, Nemesis (astronomy), Nemesis (star), Nemesis Theory, Nemesis hypothesis, Nemesis star.

References

[1] https://en.wikipedia.org/wiki/Nemesis_(hypothetical_star)

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