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What are gravitational lenses?

Ninety years ago, Arthur Eddington undertook an expedition to West Africa to confirm Albert Einstein's general theory of relativity. Eddington was not, of course, an ethnologist or geologist but an astrophysicist and he observed the solar eclipse there on 29 May 1919. This enabled him to photograph stars in the region around the Sun - stars which would otherwise have been obscured by the Sun.

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