Starting off my first question, how is time in space or on other planets different to earth is it just that it takes longer for that planet to do a full rotation meaning longer or more hours in a “day”?
then if Space/planet time is different to time on earth, how dose someone age slower in space than they do on earth, wouldnt your body still be replacing cells at the same rate and be “aging” at the same time?
is the “1 hour here is 7 hours on earth” just some movie gimmick for drama
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For those “one day on mars is 40 minutes longer” is just (roughly) how long it takes for it to spin around once. This is called sideral day if it measures according to the stars or solar day if it measures according to the sun. They vary because the sun is so close and sometimes when planets spin slowly they move quite a lot in one rotation.
The thing you see in movies where one minute here is x minutes on earth is usually time dilation and is often caused by gravitiy (in those scenes). Usually we do not care about this, but at high gravitiy differences (usually black holes in movies) time starts to pass differently for two observers. It also happens when two observers are at different speeds, which is why an astronaut and their twin on earth will be of different age when they meet again. For most of what we humans experience this is so small we never notice. But if we were to actually move near a black hole (or at near speed of light speeds) it would start to be noticable.
We did do an experiment where we sent one atomic clock on a high speed plane and another was sitting still. They became out of sync ever so slightly afterwards. Talking less than seconds tho. So nothing that impacts us in any daily scenarios.
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