“时间”存在吗?Does Time Exist?

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The earliest time measurements were observations of cycles of the natural world, using patterns of changes from day to night and season to season to build calendars.

More precise time-keeping, like sundials and mechanical clocks, eventually came along to put time in more convenient boxes.

But what exactly is it that we're measuring?

Is time something that physically exists, or is it just in our heads?

At first the answer seems obviousof course time exists; it constantly unfolds all around us, and it's hard to imagine the universe without it.

But our understanding of time started getting complicated thanks to Einstein.

His theory of relativity tells us that time passes for everyone, but doesn't always pass at the same rate for people in different situations, like those travelling close to the speed of light or orbiting a supermassive black hole.

Einstein resolved the malleability of time by combining it with space to define space-time, which can bend, but behaves in consistent, predictable ways.

Einstein's theory seemed to confirm that time is woven into the very fabric of the universe.

But there's a big question it didn't fully resolve: why is it we can move through space in any direction, but through time in only one?

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