giant radio galaxies

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• Radio galaxy — Radio galaxies and their relatives, radio loud quasars and blazars, are types of active galaxy that are very luminous at radio wavelengths (up to 1038 W between 10 MHz and 100 GHz). The radio emission is due to the synchrotron process. The… …   Wikipedia

• Giant diffuse galaxy — A giant diffuse galaxy is a supermassive, elliptical galaxy that is usually located in the centre of a cluster of galaxies. The term is often contracted to cD galaxies [cite journal title=A Discussion of Galaxies Identified With Radio Sources… …   Wikipedia

• radio source — Astron. a cosmic object or phenomenon, as a galaxy, pulsar, quasar, or the remnant of a supernova or of a galactic collision, that emits radio waves. [1945 50] * * * ▪ astronomy       in astronomy, any of various objects in the universe that emit …   Universalium

• Galaxies in fiction — Galaxies other than the Milky Way are popular settings for creators of science fiction, particularly those working with broad scale space opera settings. Among the most common settings are the Andromeda Galaxy, the Magellanic Clouds, and the… …   Wikipedia

• Giant Metrewave Radio Telescope — Infobox Telescope bgcolour = name = Giant Metrewave Radio Telescope caption = Giant Metrewave Radio Telescope at sunset organization = NCRA location = 10 kilometre!km east of Narayangaon, India wavelength = radio 50 to 1500 MHz built = First… …   Wikipedia

• Radio telescope — A radio telescope is a form of directional radio antenna used in radio astronomy and in tracking and collecting data from satellites and space probes. In their astronomical role they differ from optical telescopes in that they operate in the… …   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

• Récession des galaxies — Galaxie  Cet article concerne les galaxies au sens général. Pour les articles homonymes, voir Galaxie (homonymie). Pour notre propre galaxie, voir Voie lactée …   Wikipédia en Français

• Ooty Radio Telescope — Radio Telescope at Ooty Organization Tata Institute of Fundamental Research …   Wikipedia

• Dwingeloo Radio Observatory — The 25 meter Dwingeloo radio telescope The Dwingeloo Radio Observatory (near Dwingeloo, m. Westerveld, in the northeastern Netherlands), is a single dish radio telescope with a diameter of 25 m. Construction started in 1954, the telescope… …   Wikipedia

• galaxy — /gal euhk see/, n., pl. galaxies. 1. Astron. a. a large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space. b. (usually cap.) See Milky Way. 2. any large and brilliant or impressive… …   Universalium