Time is not absolute from "summary" of A Breif History of Time and the Universe in a Nutshell by Stephen Hawking
In our everyday experience, time seems to flow smoothly from past to present to future, ticking away consistently. However, according to the theory of relativity proposed by Albert Einstein, time is not as absolute as we might think. Instead, time is intertwined with space to form a four-dimensional continuum known as spacetime. One of the key insights of Einstein's theory is that time is not the same for everyone and everywhere. This concept, known as time dilation, suggests that time can stretch or contract depending on the speed at which an object is moving or the strength of the gravitational field it is in. For example, time moves slower for objects in motion relative to those at rest, a phenomenon that has been confirmed through experiments involving atomic cloc...
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