I’ve seen people explain it before but I have absolutely no idea what they are talking about. An example of what I’m saying would be the movie interstellar or the old planet of the apes movie. It makes absolutely no sense.
In: Physics
First, consider how things move relative to one another.
If I’m standing still and a train passes me, from my point of view I’m stationary and the train is moving. What about a passenger on the train watching a second passenger walk down the aisle? From the first passenger’s POV, within the train they themselves are stationary, while the second passenger is moving.
Point is, movement is measured differently from different perspectives, and there’s **no one true perspective**. This is classical relativity. Objects can be described mathematically as moving at different speeds depending on who is looking (i.e. the frame of reference).
BUT scientists discovered that **light has a constant speed** no matter what perspective it is observed and measured from. How can that be when speed depends on the observer?
Einstein realised that light can remain constant if time itself moves at different speeds. He proved that the faster something moves through space, the slower it moves through time. This allows the speed of light to remain constant, no matter the reference frame / observer.
It’s weird stuff to wrap your head around, but hope that helps! [This video](https://youtu.be/ajhFNcUTJI0) might help.
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