What's Time? (In Science) - Deepstash
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What's Time? (In Science)

What's Time? (In Science)

Time is a measure of non-stop, consistent change in our surroundings, usually from a specific viewpoint.

While the concept of time is self-evident and intuitive – the steady passing of events before our eyes; the orbit of the Moon around our planet – describing its fundamental nature is much harder.

Even physicists aren't sure what actually happens when time passes. Although they do have a few hypotheses.

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Why is there a future and a past?

Why is there a future and a past?

Models of space-time can describe measurements of time and space varying from one point to the next, but they don't explain much about time's stubborn adherence to a sequence of events.

Under these descriptions of time, our Universe is a single block of space-time. There's sort of a beginni...

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How does time work?

How does time work?

For centuries, time was regarded as a constant, independent force, as if the Universe's progress is governed by a single clock.

This description of time changed in 1905 with Albert Einstein's theory of special relativity.

While the passing of time was already known to be closely conne...

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284 reads

Is time real?

Is time real?

Two people moving at the same velocity will each agree their measures of distance and time match. As one person changes speed, however, they will see the other's measure of time and distance change, even as their own stays the same.

Without any reason to prioritize one perspective of time o...

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Is it possible to reverse time?

Is it possible to reverse time?

Of course, for us to actually see these effects on time, the change in speed or gravitational pull must be enormous. But as an observer accelerates towards the speed of light, unique measures of time become increasingly noticeable.

In theory, as a particle approaches the speed of light, we ...

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231 reads

What about time travel?

What about time travel?

similarly, the space-contorting volume beyond the horizon of a black hole also distorts perspectives of time.

in our universe, we have freedom of space and can move around as we like, but we're forced to march along time's arrow in a linear direction.

Calculations show that crossing o...

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