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gravitational microlensing
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Illustration of gravitational microlensing showing a lens moving between Earth and a distant star. When the lens (a massive object such as an extrasolar planet) is between Earth and the star, it increases the star's brightness.
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Nicolaus Copernicus. Nicolas Copernicus (1473-1543) Polish astronomer. In 1543 he published, forward proof of a Heliocentric (sun centered) universe. Coloured stipple engraving published London 1802. De revolutionibus orbium coelestium libri vi.
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Photos

Illustration of gravitational microlensing showing a lens moving between Earth and a distant star. When the lens (a massive object such as an extrasolar planet) is between Earth and the star, it increases the star's brightness.
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Nicolaus Copernicus. Nicolas Copernicus (1473-1543) Polish astronomer. In 1543 he published, forward proof of a Heliocentric (sun centered) universe. Coloured stipple engraving published London 1802. De revolutionibus orbium coelestium libri vi.
All About Astronomy