Gravitational Lensing

A gravitational lens is a distribution of matter (such as a cluster of galaxies) between a distant light source and an observer, that is capable of bending the light from the source as the light travels towards the observer. This effect is known as gravitational lensing, and the amount of bending is one of the predictions of Albert Einstein's general theory of relativity.[1][2] (Classical physics also predicts the bending of light, but only half that predicted by general relativity.[3])
Although Einstein made unpublished calculations on the subject in 1912,[4] Orest Khvolson (1924)[5] and Frantisek Link (1936)[citation needed] are generally credited with being the first to discuss the effect in print. However, this effect is more commonly associated with Einstein, who published a more famous article on the subject in 1936.[6]

A Horseshoe Einstein Ring from Hubble.JPG 

https://en.wikipedia.org/wiki/Gravitational_lens 

http://w.astro.berkeley.edu/~jcohn/lens.html 

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