Time is not absolute from "summary" of Seven Brief Lessons on Physics by Carlo Rovelli
The idea that time is not absolute is one of the most remarkable insights that humanity has ever had. This concept emerged from Einstein's theory of general relativity, which fundamentally changed our understanding of the nature of time. According to this theory, time is not an immovable, universal entity that ticks away in the background of the universe. Instead, time is flexible and malleable, changing and warping in response to the presence of mass and energy. In other words, time is not a fixed framework within which events unfold. Rather, time is intertwined with space in a four-dimensional fabric known as spacetime. This concept of spacetime is crucial for understanding how gravity works, as massive objects like stars and plane...
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