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Encyclopedia > Sagittarius A*

Sagittarius A* (pronounced "A-star") is a bright and very compact source of radio emission at the center of the Milky Way Galaxy, part of a larger astronomical feature at that location (Sagittarius A). Although not completely certain, this radio source is regarded by most astronomers to be associated with the supermassive black hole at the center of our galaxy, an object with a mass equivalent to about 2-4 million solar masses (our sun's mass is approximately 2×1030 kg). The Milky Way (a translation of the Latin Via Lactea, in turn derived from the Greek Galaxia Kuklos; or simply the Galaxy) is a barred spiral galaxy in the Local Group, and has special significance to humanity as the location of the solar system, which is located near the Orion... Sagittarius A (or Sgr A) is a complex radio source at the centre of our galaxy, the Milky Way. ... An astronomer or astrophysicist is a scientist whose area of research is astronomy or astrophysics. ... Top: artists conception of a supermassive black hole drawing material from a nearby star. ... In astronomy, the solar mass is a unit of mass used to express the mass of stars and larger objects such as galaxies. ... KG, Kg or kg may indicate: A Kampfgeschwader, a bomber squadron of the former German Luftwaffe Basketball Player Kevin Garnett An abbreviation for kilogram (always kg) Knight of the Garter, a British decoration Kommanditgesellschaft, German version of a limited partnership Kongo language (ISO 639 alpha-2) An abbreviation for konig...


Sagittarius A* is "associated" with the supermassive black hole, it is not the black hole itself. The observed radio energy emanates from gas and dust heated to millions of degrees while falling into the black hole. The black hole itself emits no light. In the near future, the technique of interferometry may allow the direct imaging of the event horizon. Top: artists conception of a supermassive black hole drawing material from a nearby star. ... A black hole is a concentration of mass great enough that the force of gravity prevents anything from escaping from it except through quantum tunneling behavior. ... A black hole is a concentration of mass great enough that the force of gravity prevents anything from escaping from it except through quantum tunneling behavior. ... A black hole is a concentration of mass great enough that the force of gravity prevents anything from escaping from it except through quantum tunneling behavior. ... Interferometry is the applied science of combining two or more input points of a particular data type, such as optical measurements, to form a greater picture based on the combination of the two sources. ... Event Horizon is a 1997 science fiction and horror film. ...


Coordinates (J2000): RA 17h 45m 40.045s Dec. -29.00775 degrees (About 10 degrees to the west of the center of the constellation Sagittarius, towards Scorpio)


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