Skywatch

  • June 1, 2006

    Episode 38: Quasars, Quasars Everywhere

    Download this episode

    Shownotes

    A single, distant quasar can be seen five times in a recent Hubble Space Telescope picture, thanks to an effect called "gravitational lensing." The gravity of a cluster of foreground galaxies bends and amplifies the light from the more-distant quasar. Light from the quasar, the core of a galaxy powered by a supermassive black hole, is both magnified and bent, creating the five separate images.