Questions about Sagittarius A*, abbreviated Sgr A*, the "bright and very compact astronomical radio source at the center of the Milky Way" galaxy, believed to be the result of a supermassive black hole.

Saggitarius A* is a compact source that emits very brightly in radio. It is located at the center of the Milky Way, near the border between the Sagittarius and Scorpio constellarions. Based on the trajectory of stars around it, it has been determined to be the location of a supermassive black hole.