Theory of general relativity from "summary" of A Breif History of Time and the Universe in a Nutshell by Stephen Hawking
The theory of general relativity, proposed by Albert Einstein in 1915, revolutionized our understanding of gravity. According to this theory, gravity is not a force that attracts objects to each other, as Newton had thought, but rather a consequence of the curvature of space and time. In other words, massive objects like stars and planets warp the fabric of spacetime around them, causing other objects to move along curved paths. One of the key predictions of general relativity is the bending of light by gravity. This was famously confirmed during a solar eclipse in 1919, when astronomers observed stars near the sun appearing slightly out of place due to the sun's gravitational field. This bending of light is now known as gravitational lensing, and it has since been observed in many diffe...
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