• December 27, 2007

    Episode 136: Galactic Coverup

    Download this episode


    Sometimes those serene, rounded elliptical galaxies harbor much deeper and more interesting structures. In Hubble Space Telescope observations, one elliptical galaxy shows shells-shaped groups of stars that probably originated in a violent collision between galaxies. The material from the merger is feeding a supermassive black hole in the galaxy's center, creating a quasar that emits enough energy to be seen across the universe.