As far as theoretical physics goes, time doesn’t really exist. It is just how our brains process cause and event. But, our perception of time flowing is also based on where we are and how fast we are moving. If you look at other thing, you are always “stationary.”. So, if you are in a car driving at 60 mph, someone standing on the side of the road is actually moving past you, from your perspective.
This means, for you, time is constant, but that guy outside appears to move much slower since your relative speeds are different. Now, will you see a difference? Absolutely not.
However, experiments have shown that time dialation is real and measurable.
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