42 relations: Accretion (astrophysics), Apparent magnitude, Bayer designation, Binary star, Black hole, Blue straggler, Cataclysmic variable star, Chandra X-ray Observatory, Chromosphere, Constellation, Earth, Eclipse, Epoch (astronomy), European Southern Observatory, Fermi Gamma-ray Space Telescope, Globular cluster, Hubble Space Telescope, Johann Elert Bode, John Flamsteed, Light-year, Mass segregation, Metallicity, Millisecond pulsar, Monthly Notices of the Royal Astronomical Society, Moon, Naked eye, Neutron star, New General Catalogue, Nicolas Louis de Lacaille, Omega Centauri, Patrizia A. Caraveo, Planet, Pulsar, Ragbir Bhathal, Small Magellanic Cloud, Tucana, Western Sydney University, White dwarf, X-ray, X-ray binary, Year, 1RXS.
In astrophysics, accretion is the growth of particles into a massive object by gravitationally attracting more matter, typically gaseous matter in an accretion disc.
The apparent magnitude (m) of a celestial object is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere.
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A Bayer designation is a stellar designation in which a specific star is identified by a Greek letter, followed by the genitive form of its parent constellation's Latin name.
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A binary star is a star system consisting of two stars orbiting around their common center of mass.
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A black hole is a geometrically defined region of spacetime exhibiting such strong gravitational effects that nothing—including particles and electromagnetic radiation such as light—can escape from inside it.
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Blue stragglers (BSS) are main-sequence stars in open or globular clusters that are more luminous and bluer than stars at the main-sequence turn-off point for the cluster.
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Cataclysmic variable stars (CV) are stars which irregularly increase in brightness by a large factor, then drop back down to a quiescent state.
The Chandra X-ray Observatory (CXO), previously known as the Advanced X-ray Astrophysics Facility (AXAF), is a space observatory launched on STS-93 by NASA on July 23, 1999.
The chromosphere (literally, "sphere of color") is the second of the three main layers in the Sun's atmosphere and is roughly 2,000 kilometers deep.
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In modern astronomy, a constellation is a specific area of the celestial sphere as defined by the International Astronomical Union (IAU).
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Earth (also the world, in Greek: Gaia, or in Latin: Terra), is the third planet from the Sun, the densest planet in the Solar System, the largest of the Solar System's four terrestrial planets, and the only astronomical object known to accommodate life.
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An eclipse is an astronomical event that occurs when an astronomical object is temporarily obscured, either by passing into the shadow of another body or by having another body pass between it and the viewer.
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In astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as the celestial coordinates or elliptical orbital elements of a celestial body, because these are subject to perturbations and vary with time.
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The European Southern Observatory (ESO, formally: European Organisation for Astronomical Research in the Southern Hemisphere; Observatoire européen austral) is a 16-nation intergovernmental research organisation for astronomy.
The Fermi Gamma-ray Space Telescope (FGST), formerly called the Gamma-ray Large Area Space Telescope (GLAST), is a space observatory being used to perform gamma-ray astronomy observations from low Earth orbit.
A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite.
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The Hubble Space Telescope (HST) is a space telescope that was launched into low Earth orbit in 1990, and remains in operation.
Johann Elert Bode (19 January 1747 – 23 November 1826) was a German astronomer known for his reformulation and popularization of the Titius–Bode law.
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John Flamsteed FRS (19 August 1646 – 31 December 1719) was an English astronomer and the first Astronomer Royal.
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A light-year (abbreviation: ly), sometimes written light year, is a unit of length used informally to express astronomical distances.
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In astronomy, dynamical mass segregation is the process by which heavier members of a gravitationally bound system, such as a star cluster or cluster of galaxies, tend to move toward the center, while lighter members tend to move farther away from the center.
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In astronomy and physical cosmology, the metallicity or Z, is the fraction of mass of a star or other kind of astronomical object, beyond hydrogen (X) and helium (Y).
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A millisecond pulsar (MSP) is a pulsar with a rotational period in the range of about 1-10 milliseconds.
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Monthly Notices of the Royal Astronomical Society (MNRAS) is a peer-reviewed scientific journal covering research in astronomy and astrophysics.
The Moon (in Greek: Selene, in Latin: Luna) is Earth's only natural satellite.
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Naked eye (also called bare eye) is the practice of engaging in visual perception unaided by a magnifying or light-collecting optical device, such as a telescope or microscope.
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A neutron star is a type of compact star that can result from the gravitational collapse of a massive star after a supernova.
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The New General Catalogue of Nebulae and Clusters of Stars (abbreviated as NGC) is a well-known catalogue of deep-sky objects in astronomy compiled by John Louis Emil Dreyer in 1888, as a new version of John Herschel's Catalogue of Nebulae and Clusters of Stars.
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Abbé Nicolas Louis de La Caille, sometimes spelled Lacaille, (28 December 1713 – 21 March 1762) was a French astronomer and priest.
Omega Centauri (ω Cen), or NGC 5139, is a globular cluster in the constellation of Centaurus that was first identified as a non-stellar object by Edmond Halley in 1677.
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Patrizia Caraveo (born April 8, 1954, Milan) is an Italian astrophysicist.
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A planet is an astronomical object orbiting a star, brown dwarf, or stellar remnant that.
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A pulsar (short for pulsating radio star) is a highly magnetized, rotating neutron star that emits a beam of electromagnetic radiation.
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The Small Magellanic Cloud (SMC) is a dwarf galaxy near the Milky Way.
Tucana is a constellation of stars in the southern sky, named after the toucan, a South American bird.
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Western Sydney University, formerly the University of Western Sydney, is an Australian multi-campus university in the Greater Western region of Sydney.
A white dwarf, also called a degenerate dwarf, is a stellar remnant composed mostly of electron-degenerate matter.
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X-radiation (composed of X-rays) is a form of electromagnetic radiation.
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X-ray binaries are a class of binary stars that are luminous in X-rays.
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A year is the orbital period of the Earth moving in its orbit around the Sun.
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1RXS is an acronym which is the prefix used for the First ROSAT X-ray Survey (1st ROSAT X-ray Survey).
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