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Time is a physical property that measures and compares all motion in the universe. All motion in the universe has cause and effect, meaning that there is a beginning and an end to all motion in the universe. This cause and effect is the reason why time is observed to have one direction. Humans perceive this cause and effect as past, present, and future. The past is the totality of all completed motion. The present refers to all motion in progress. And the future refers to the inevitable end of all present motion as well as to all successive motion that will inevitably follow. Time measures both the internal and external motion of matter. The internal motion refers to the motion of the particles making up the atoms and molecules inside bodies. This internal motion is responsible for the formation and evolution of bodies as well as their inevitable and gradual decomposition into nothing. The external motion refers to the motion of those bodies through space. Time is basically all of history meaning that it is the history of the whole universe. Time is considered as the fourth dimension in Einstein's theories of relativity along with the three dimensions of space to form a unified continuum.

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8y ago

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