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Absolute time does not exist
Time moves slower the closer you are to Earth. In his theory of general relativity, Einstein explained that the gravity of a large mass, like Earth, distorts the space and time around it.
In 2010, researchers placed two precise atomic clocks, one 33 centimetres higher than the other. Time moved slower for the clock closer to Earth. This confirmed that absolute time does not exist.
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Physics without time
If one looks at reality on the smallest scale, using equations of quantum gravity, time vanishes. However, we still perceive time as moving forward sequentially.
Key aspects of time are described by the second law of thermodynamics, which states that heat always passes from hot to cold. Ice cubes melt in hot water, never in reverse. A similar phenomenon might explain why we can only perceive the past, not the future.
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Time is subjective
Time passes differently in our mind. When we get a fright, large amounts of adrenaline released in our brain would speed up our internal clock and cause us to experience life as moving slowly.
The biggest factor influencing your time perception is attention. The more attention you give to the passage of time, the slower time seems to go. If you are distracted by something interesting, you're more likely to lose track of time.
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