In the constellation Sagittarius
4.1 million times the mass of the Sun
Diameter roughly 15 million miles (24 million km).
This 2005 infrared view from Spitzer Space Telescope captures the heart of the Milky Way in stunning detail. The red filaments are glowing clouds of gas and dust, while the brighter knots of material are nurseries for new star birth. Sagittarius A* is at the middle of the large, bright concentration at the center of the image. [NASA/JPL/S. Stolovy (SSC/Caltech) ]
This document was last modified: January 12, 2006.