In a paper published in 1936, Einstein worked out the basic idea of what is now called gravitational lensing. Because gravity bends light, or any other kind of radiation, a large mass can act like a giant lens, bending approaching light and radio waves around it, and magnifying them. The sun can be thought of as a gravitational lens. So can any star, or galaxy, or even cluster of galaxies.
The Sun Can Be Used as a Giant “Gravity Lens” —The New Yorker
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