29 relations: Astronomer, Brady Haran, Charles Messier, Comet, Constellation, Dresden, Earth, Epoch (astronomy), European Space Agency, Globular cluster, Hertzsprung–Russell diagram, Horizontal branch, Hubble Space Telescope, Hydra (constellation), Jean-Philippe de Chéseaux, Johann Gottfried Koehler, Light-year, Messier 68, Metallicity, Monthly Notices of the Royal Astronomical Society, NASA, New General Catalogue, Open cluster, Photometry (astronomy), RR Lyrae variable, Sagitta, SKY-MAP.ORG, Space Telescope Science Institute, Variable star.
An astronomer is a scientist in the field of astronomy who studies stars, planets, moons, comets, and galaxies, as well as many other celestial objects.
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Brady John Haran (born 18 June 1976) is an Australian independent film-maker and video journalist who is known for his educational videos and documentary films produced for BBC News and for his YouTube channels, such as Numberphile and Periodic Videos.
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Charles Messier (26 June 1730 – 12 April 1817) was a French astronomer most notable for publishing an astronomical catalogue consisting of nebulae and star clusters that came to be known as the 110 "Messier objects".
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A comet is an icy small Solar System body that, when passing close to the Sun, heats up and begins to outgas, displaying a visible atmosphere or coma, and sometimes also a tail.
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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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Dresden (Drježdźany) is the capital city of the Free State of Saxony in Germany.
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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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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 Space Agency (ESA; Agence spatiale européenne, ASE; Europäische Weltraumorganisation) is an intergovernmental organisation dedicated to the exploration of space, with 22 member states.
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A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite.
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The Hertzsprung–Russell diagram, abbreviated H–R diagram or HRD, is a scatter graph of stars showing the relationship between the stars' absolute magnitudes or luminosities versus their spectral classifications or effective temperatures.
The horizontal branch (HB) is a stage of stellar evolution that immediately follows the red giant branch in stars whose masses are similar to the Sun's.
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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.
Hydra is the largest of the 88 constellations, measuring 1303 square degrees.
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Jean-Philippe Loys de Chéseaux (1718–1751) was an astronomer from Lausanne in Switzerland.
Johann Gottfried Koehler (15 December 1745 – 19 September 1801) was a German astronomer who discovered a number of nebulae, star clusters, and galaxies.
A light-year (abbreviation: ly), sometimes written light year, is a unit of length used informally to express astronomical distances.
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Messier 68 (also known as M68 or NGC 4590) is a globular cluster in the Hydra constellation.
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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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Monthly Notices of the Royal Astronomical Society (MNRAS) is a peer-reviewed scientific journal covering research in astronomy and astrophysics.
The National Aeronautics and Space Administration (NASA) is the United States government agency responsible for the civilian space program as well as aeronautics and aerospace research.
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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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An open cluster, also known as galactic cluster, is a group of up to a few thousand stars that were formed from the same giant molecular cloud and have roughly the same age.
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Photometry is a technique of astronomy concerned with measuring the flux, or intensity of an astronomical object's electromagnetic radiation.
RR Lyrae variables are periodic variable stars, commonly found in globular clusters, and are used as standard candles to measure (extra)galactic distances.
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Sagitta is a constellation.
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SKY-MAP.ORG (or WikiSky.org) is a wiki and interactive sky map that covers more than half a billion celestial objects.
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The Space Telescope Science Institute (STSCI) is the science operations center for the Hubble Space Telescope (HST; in orbit since 1990) and for the James Webb Space Telescope (JWST; scheduled to be launched in 2018).
A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.
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