Measuring Time
We usually check the time using smartwatches and smartphones, which have clocks tallying the time with signals from atomic clocks, some of which are installed on GPS satellites.
The signals from atomic clocks are now becoming increasingly accurate, allowing us to measure gravity waves in ways previously unimaginable.
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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 fro...
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