BL lac objects

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• BL Lac object — A BL Lacertae object or BL Lac object is a type of active galaxy with an active galactic nucleus (AGN) and is named after its prototype, BL Lacertae. In contrast to other types of active galactic nuclei, BL Lacs are characterized by rapid and… …   Wikipedia

• National Register of Historic Places listings in Fond du Lac County, Wisconsin — There are 43 properties in Fond du Lac County, Wisconsin listed on the National Register of Historic Places, including buildings, sites, and districts. Map of all coordinates from Google Map of all coordinates from Bing …   Wikipedia

• National Register of Historic Places listings in Lac qui Parle County, Minnesota — Location of Lac Qui Parle County in Minnesota This is a list of the National Register of Historic Places listings in Lac Qui Parle County, Minnesota. It is intended to be a complete list of the properties and districts on the National Register of …   Wikipedia

• 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

• Blazar — A blazar is a very compact and highly variable energy source associated with a presumed supermassive black hole at the center of a host galaxy. Blazars are among the most violent phenomena in the universe and are an important topic in… …   Wikipedia

• 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

• Messier 87 — Virgo A The Messier 87 galaxy. Observation data Epoch J2000 Constellation Virgo Right ascension …   Wikipedia

• BL Lacertae — or BL Lac is a highly variable, extragalactic AGN (active galactic nucleus or active galaxy). It was first discovered by Cuno Hoffmeister in 1929 [cite journal | last= Hoffmeister |first= Cuno |year= 1929 |title=354 neue Veränderliche|journal=… …   Wikipedia

• OJ 287 — Observation data (Epoch J2000) Constellation Cancer Right ascension 08h 54m 48.9s[1] …   Wikipedia

• Markarian 421 — Hubble Legacy Archive WFPC2 image of Mark 421 and its companion galaxy 421 5 Observation data (Epoch J2000) Constellation …   Wikipedia

• Physical Research Laboratory — The Physical Research Laboratory is a national Indian centre for research in space and allied sciences, supported mainly by Department of Space. This research laboratory currently has ongoing research programmes over astronomy and astrophysics,… …   Wikipedia