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ⓘ Astronomical objects - Astronomical object, Lists of astronomical objects, Near-Earth object, Dark nebula, Extinction, astronomy ..



                                               

Astronomical object

Astronomical object refers to something that astronomers study. It may be any body or structure in the observable universe. This includes objects like nebulas, star clusters, galaxy clusters, galaxies, stars, protostars, planets, satellites, comets, asteroids. Objects on the Earth are not usually included, except sometimes recently landed meteorites.

                                               

Lists of astronomical objects

This is a partial list of the various lists of astronomical objects which either exist, or should exist, in Wikipedia. List of exoplanets List of planetary moons List of planets List of nearest stars List of stars List of brightest stars List of asteroids List of trans-Neptunian objects List of comets Minor planets List of semiregular variable stars List of gamma-ray bursters List of quasars List of black holes List of traditional star names List of blazars List of globular clusters List of galaxies List of nearest galaxies List of stars with confirmed extrasolar planets List of pulsars Li ...

                                               

Near-Earth object

A near-Earth object is a Solar System object whose orbit brings it close to the Earth. Their least distance from the Sun, their perihelion, is less than 1.3 AU. NEOs include near-Earth asteroids NEAs and near-Earth comets. They include more than ten thousand near-Earth asteroids NEAs, near-Earth comets, some solar-orbiting spacecraft, and meteoroids large enough to be tracked in space before striking the Earth. Collisions in the past have had a significant role in shaping the geological and biological history of the planet. In some cases NEOs hit the Earth. Most of these meteors explode ha ...

                                               

Dark nebula

Dark nebulae are astronomical objects. They do not emit or reflect light. They are seen when they hide stars and galaxies behind them. The astronomer Edward Emerson Barnard compiled a list of dark nebulae known as the Barnard Catalogue of Dark Markings in the Sky, or the Barnard Catalogue for short. The nebulae listed by Barnard have become known as Barnard objects. These are the best-known dark nebulae: Horsehead nebula Barnard 33 Snake nebula (also see Dark Horse nebula Pipe nebula also see Dark Horse nebula; includes Barnard 59, 77 and 78 Dark Doodad nebula Cone nebula Coalsack nebula D ...

                                               

Extinction (astronomy)

Interstellar extinction is when the electromagnetic radiation of an astronomical object is blocked and/or scattered by other astronomical objects and cosmic dust. Also known as galactic extinction when the object is in the Milky Way.

                                               

International Astronomical Union

The International Astronomical Union is an international group that brings together the national astronomical groups from around the world. It was created in 1919. It was created to promote and protect the science of astronomy by getting different nations to work together. Its members are professional astronomers from all over the world, and they all work on research and education in astronomy. The IAU has good relationships with groups that include amateur astronomers. "National Members" are usually people with a high level of professional astronomy. There are more than 10.000 active "Ind ...

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