Learn about Astrophysics: Cosmic Light, Quasars and Einstein Ring in this educational video from dizzo95.
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Male Speaker: Light normally travels directly towards us from a distant galaxy or Quasar. But if another compact galaxy lies in the path of the light, its gravity acts like a lens it can just start and magnify our view of the quasar, changing it from a point into a circle, called an Einstein ring. If the galaxy acting as a gravitational lens has spiral structure, the image may be multiple rather than circular, a known example like this is called the Einstein cross.