According to Einstein’s theory, gravity produces what is, in effect, an index of refraction.  Light passing in the vicinity of an astronomical object will be delayed, deflected and distorted by the variations in this index of refraction, in a manner exactly analogous to terrestrial mirages.  Such cosmic mirages are a major tool for the study of dark matter in galaxies and clusters of galaxies.

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A complete listing of MKI’s IAP offerings for 2015, is available here.