Gravitational lens/Definition

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https://en.citizendium.org/wiki/index.php?title=Gravitational_lens/Definition&printable=yes
A definition or brief description of Gravitational lens.

A lens formed when light from a very distant, bright source (such as a quasar) is 'bent' around a massive object (such as a cluster of galaxies) between the source object and the observer.

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