Sagittarius A*

…have identified the radio source Sagittarius A*, which is offset from the longitude zero point, as the true centre of the Milky Way Galaxy.)

… wavelengths and has been dubbed Sagittarius A* by radio astronomers. Somewhat similar to the centres of active galaxies (see below), though on a lesser scale, the galactic nucleus is the site of a wide range of activity apparently powered by the black hole. Infrared radiation and X-rays are emitted from…

Sagittarius A* (pronounced “Sagittarius a star”) is a compact, extremely bright point source. X-ray, infrared, spectroscopic, and radio interferometric investigations have indicated the very small dimensions of this region; the event horizon of the black hole has a radius of 12 million km (7 million…

…compact and energetic source, designated Sagittarius A*, at the centre of the galaxy. Sagittarius A* is a supermassive black hole with a mass equivalent to 4,310,000 Suns.

>Sagittarius A*, exists at the centre of the Milky Way Galaxy. Observations of stars orbiting the position of Sagittarius A* demonstrate the presence of a black hole with a mass equivalent to more than 4,000,000 Suns. (For these observations, American astronomer Andrea Ghez and German…