Gravitational lensing is seen in when the gravitational field of a foreground galaxy causes the light from a background, distant quasar to be bent in such a way that the quasar no longer appears as a single star-like object. Sometimes multiple images of the quasar are seen. When the galaxy and quasar are perfectly aligned along our line of sight, we see an "Einstein Ring".
"Gravitational Lenses", Turner, E.L. 1988, Scientific American July, 54.
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