Optical CCD image of Einstein ring

Optical CCD image of Einstein ring

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Caption: Gravitational lensing. Optical CCD (charge coupled device) image of a large "luminous arc" associated with Galaxy Cluster 2242-02. Several theories have been put forward to explain such arcs. Most popular of these is that the arc is part of an Einstein ring: the smeared-out image of a distant galaxy or quasar whose light has been "lensed" by the gravity of the cluster of galaxies. Einstein proposed the effect of gravitational lensing in 1936.

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Keywords: 2242-02, astronomy, cosmology, einstein ring, galaxy cluster 2242-02, gc 2242-02, gravitational, gravitational lensing, in galaxy, lensing, luminous arc, science

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