In observational astronomy an Einstein ring, also known as an ... - dofaq.co
einstein ring

In observational astronomy an Einstein ring, also known as an ...

wikipedia - 03 Aug 2015
In observational astronomy an Einstein ring, also known as an Einstein-Chwolson ring or Chwolson ring, is the deformation of the light from a source (such as a galaxy or star) into a ring through gravitational lensing of the source's light by an object with an extremely large mass (such as another galaxy or a black hole). This occurs when the source, lens, and observer are all aligned. The first complete Einstein ring, designated B1938+666, was discovered by collaboration between astron

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