Cosmic Backlighting: Distant Quasar Lights Up Galactic Halo | Video
Thursday, April 25, 2013 - 08:31
in Astronomy & Space
The heat from newborn stars creates a halo of gas around its parent galaxy. When a distant galaxy's black hole-powered light is absorbed by the gas, the Hubble Space Telescope's Cosmic Origins Spectrograph (COS) can detect it.