Quote:
The difference isn't noticeable though — after spending six months on the ISS, astronauts have aged about 0.005 seconds less than the rest of us. That means when astronaut Scott Kelly gets back from his year-long stay on the ISS, he'll technically be 0.01 second younger than his twin brother Mark Kelly who stayed on Earth.
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I think time dilation's a myth. A lot of factors involved such as gravitational pull and speeds of the rocket spaceship can be up to if not more then 5 miles per second.
Who knows tho. There are many theories on the subject lol.