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Einstein cross

From Wiktionary, the free dictionary

English

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Etymology

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From Einstein (Albert Einstein) +‎ cross. From the shape of a cross, of four points at roughly square angles around a central object, caused by distortions in the path of light's travel due to Einsteinian relativity (Albert Einstein's general relativity) creating four points out of a single light source behind the off-center central object. (An on-center central object results in an Einstein ring.).

Noun

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Einstein cross (plural Einstein crosses)

  1. (astronomy, physics) A gravitational lens configuration resulting in four duplicated images of the back ground image around the central gravitationally lensing object, in a cross configuration.

Derived terms

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  • Einstein Cross (the first discovered gravitationally-lensed quasar in this configuration)
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Anagrams

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