Chandra X-ray Observatory image of Sagittarius A and A*
A strong source of radio waves at the heart of the Milky Way Galaxy made up of several components. Sagittarius A West is a thermal radio source associated with three small arms of ionized gas and dust that are spinning around the center, and resembles a miniature spiral galaxy. Sgr A East is a nonthermal source, about 39 light-years across, that appears to be a supernova remnant. The very center of the Milky Way is marked by an intense radio source, called Sagittarius A*, which is probably a massive black hole.
