M31

Mysterious Disk of Blue Stars Around Black Hole in M31 |  A team of astronomers including NOAO scientists have used the Hubble Space Telescope to identify the source of a mysterious blue light surrounding a supermassive black hole in our neighboring Andromeda Galaxy (M31). The strange light has puzzled astronomers for more than a decade. Hubble Press Release

Infrared image of the Andromeda Galaxy taken with the Mayall 4-meter telescope at KPNO.

Credit: T. Lauer (NOAO/AURA/NSF)