Time is not absolute but dependent on the observer from "summary" of Reality Is Not What It Seems by Carlo Rovelli
Time, as we experience it, is not an absolute entity that exists independently of us. It is not a fixed and unchanging element of the universe, as we tend to believe. Time is, in fact, a subjective concept that is dependent on the observer. This means that the passage of time can vary depending on one's perspective and frame of reference. The theory of relativity, formulated by Einstein, revolutionized our understanding of time. According to this theory, time is not a universal constant but a flexible dimension that can be influenced by factors such as motion and gravity. The rate at which time flows can differ for two observers based on their relative motion or gravitational fields. For example, imagine two people - one on Earth and the other traveling through space at near-light speeds. From the perspective of the person on Earth, time for the traveler would appear to slow down. This phenomenon, known as time dilation, demonstrates how time is not a fixed entity but instead a malleable concept that is shaped by the observer's circumstances. Furthermore, the theory of relativity also suggests that time is intertwined with space to form a four-dimensional continuum known as spacetime. This interconnected nature of time and space implies that our perception of time is inherently linked to our perception of space. The curvature of spacetime, caused by massive objects like stars and planets, can bend the path of light and distort our perception of time.- The concept of time being relative challenges our conventional understanding of reality. It invites us to question our preconceived notions of a linear and absolute time flow. Instead, we are prompted to consider time as a dynamic and subjective dimension that is intricately connected to our observations and experiences. Time, therefore, is not a fixed quantity but a fluid entity that adapts and changes based on the observer's vantage point.
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