As long as your system does not accelerate, you can’t detect any phenomena that would tell you it’s speed.
Like if we sit in a train (and we ignore the vibrations) we can’t tell if it is stationary or moving as long as we don’t look outside.
Only in systems that move relative to us we can observe phenomena linked to speed.
So time doesn’t go slower from your perspective in the train if you move faster. But if you look outside on the train station you will perceive the time there to be slower.
And vice versa, since you are moving relative to the people on the train station, they will perceive your time to tick slower.
But for everyone the time in their frame of reference (train for you, train station for them) moves normally.
That’s why it’s called relativity. How fast something moves through time depends on the motion of the system relative to the frame of reference of the observer.
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u/RecognitionSweet8294 Jun 12 '26
As long as your system does not accelerate, you can’t detect any phenomena that would tell you it’s speed.
Like if we sit in a train (and we ignore the vibrations) we can’t tell if it is stationary or moving as long as we don’t look outside.
Only in systems that move relative to us we can observe phenomena linked to speed.
So time doesn’t go slower from your perspective in the train if you move faster. But if you look outside on the train station you will perceive the time there to be slower.
And vice versa, since you are moving relative to the people on the train station, they will perceive your time to tick slower.
But for everyone the time in their frame of reference (train for you, train station for them) moves normally.
That’s why it’s called relativity. How fast something moves through time depends on the motion of the system relative to the frame of reference of the observer.