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The theory of general relativity from "summary" of Seven Brief Lessons on Physics by Carlo Rovelli

In the early 20th century, Albert Einstein revolutionized our understanding of gravity with his theory of general relativity. According to Einstein, gravity is not a force that pulls objects towards each other, as Isaac Newton had proposed, but rather a curvature in the fabric of spacetime caused by mass and energy. In Einstein's view, massive objects like planets and stars bend the fabric of spacetime around them, creating a sort of "dimple" that influences the motion of other objects nearby. This curvature of spacetime is what we experience as gravity - the force that keeps us anchored to the Earth and governs the motion of celestial bodies in the universe. One of the most remarkable predictions of general relativity is the existence of black holes - regions of spacetime where the gravitational pull is so strong that nothing, not even light, can escape. Black holes are formed when massive stars collapse under their own gravity, creating a singularity - a point of infinite density where the laws of physics as we know them break down. General relativity also predicts the phenomenon of gravi...
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    Seven Brief Lessons on Physics

    Carlo Rovelli

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