The theory of relativity and the fabric of spacetime from "summary" of The Elegant Universe: Superstrings, Hidden Dimensions, and the Quest for the Ultimate Theory by Brian Greene
The theory of relativity revolutionized our understanding of the universe by revealing the intimate connection between space and time. According to this theory, developed by Albert Einstein in the early 20th century, space and time are not separate and absolute entities but are intertwined in a single fabric known as spacetime. This fabric can be warped and distorted by the presence of matter and energy, giving rise to the force of gravity. One of the key insights of the theory of relativity is that the laws of physics are the same for all observers, regardless of their relative motion. This principle, known as the principle of relativity, implies that there is no privileged frame of reference in the universe. Instead, all observers are equally valid, and their observations are relative to their own perspective. Another important consequence of the theory of relativity is the equivalence of mass and energy, encapsulated in Einstein's famous equation E=mc^2. This equation shows that mass can be conv...
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