emission line galaxies

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• Low-ionization nuclear emission-line region — cite journal author= L. C. Ho, A. V. Filippenko, W. L. W. Sargent title=A Search for Dwarf Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies journal=Astrophysical Journal Supplement year=1997 volume=112… …   Wikipedia

• Hydrogen line — For hydrogen lines in general, see Hydrogen spectral series. The hydrogen line, 21 centimeter line or HI line refers to the electromagnetic radiation spectral line that is created by a change in the energy state of neutral hydrogen atoms. This… …   Wikipedia

• Timeline of knowledge about galaxies, clusters of galaxies, and large-scale structure — Timeline of galaxies, clusters of galaxies, and large scale structure of the cosmosPre 20th Century* 400s BC Democritus proposes that the bright band in the night sky known as the Milky Way might consist of stars, * 300s BC Aristotle believes the …   Wikipedia

• Vide du Bouvier — Carte du Vide du Bouvier Le Vide du Bouvier ou Grand Vide[1] est une région de l espace interstellaire de très grande taille mais contenant très peu de galaxies. Elle doit son nom à la constellation du Bouvier …   Wikipédia en Français

• Boötes void — The Boötes void is a tremendously large, approximately spherically shaped nearly empty region of space, devoid of galaxies. At nearly 250 million light years in diameter, it is one of the largest known voids in the universe, and is referred to as …   Wikipedia

• Steven Hawley — Infobox Astronaut name =Steven Alan Hawley type =Astronaut nationality =American date birth =birth date and age|1951|12|12 place birth =Ottawa, Kansas occupation =Director of Astromaterials Research and Exploration Science, Johnson Space Center… …   Wikipedia

• Jeremy Walsh — For the suffragan bishop of Tewkesbury see Jeremy Walsh (Bishop) Jeremy R. Walsh is an astronomer working for the Space Telescope European Coordinating Facility (ST ECF) where he is leading the Advanced Data Products group. His background is… …   Wikipedia

• Vacío de Boötes — Mapa del vacío de Boötes El vacío de Boötes o el Gran Vacío[1] es una gigantesca y cuasi esférica región del espacio, que contiene muy pocas galaxias. Se encuentra en las cercanías de la constelación de Boötes, de ahí su no …   Wikipedia Español

• cosmos — /koz meuhs, mohs/, n., pl. cosmos, cosmoses for 2, 4. 1. the world or universe regarded as an orderly, harmonious system. 2. a complete, orderly, harmonious system. 3. order; harmony. 4. any composite plant of the genus Cosmos, of tropical… …   Universalium

• Active galactic nucleus — An active galactic nucleus (AGN) is a compact region at the centre of a galaxy which has a much higher than normal luminosity over some or all of the electromagnetic spectrum (in the radio, infrared, optical, ultra violet, X ray and/or gamma ray… …   Wikipedia

• Megamaser — A megamaser is a type of astrophysical maser, which is a naturally occurring source of stimulated spectral line emission. Megamasers are distinguished from astrophysical masers by their large isotropic luminosity. Megamasers produce roughly 103… …   Wikipedia