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Gravitational lensing allows us to see distant galaxies from "summary" of The Science of Interstellar by Kip Thorne
Gravitational lensing is a phenomenon predicted by Albert Einstein's general theory of relativity, where the gravitational field of a massive object can bend and distort light rays passing near it. This effect allows us to see objects that would otherwise be too faint or distant to detect. In the case of distant galaxies, gravitational lensing can act as a natural telescope, magnifying and enhancing the light from these faraway objects as it travels through the universe. When a massive object such as a galaxy or a cluster of galaxies lies between us and a more distant galaxy, the gravitational field of the foreground object can bend the light from the background galaxy, causing it to appear distorted or even multiple times. This phenomenon, known as strong gravitational lensing, creates beautiful and intricate patterns in the sky that can be observed and stu...
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