I’ve seen things of people aging slower in space, but any time I look it up it always comes with like 15+ words I have to look up to understand or concepts im not aware of. How does this work, and is it considered to be a form of time travel?
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Due to very complicated reasons called General Relativity, time “elongates” the more gravity there is.
Now, at first it would seem it means someone on earth would age slower than someone on the ISS.
But also time elongates *with acceleration and speed*.
And the ISS is going wayyyyyy faster than all of us ground-locked humans (it revolves around the Earth in 90 minutes !). As such, its astronautes experience a slower time than we do.
In a sense… If we assume this change is noticeable (it’s not by human standards), they would still *feel it* normally, from their point of view, but would see someone on the surface as moving faster than that someone would see themselves.
TL;DR: From an outside observer, someone that’s going real fast would seem to age slower than someone immobile. Because gravity, speed and acceleration dilate time.
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