eli5 how is time on earth different to time on other planets?

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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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Anonymous 0 Comments

The first part is true. If you were measuring days and years on the rotations of the planet you were on then they would be different.
I think what you might be confusing it with though is the fact that when you’re travelling very quickly, or standing on or next to something very heavy (with a lot of mass and a large gravitational field) then your time itself will be slower, compared to somebody who isn’t. Space is the most commonly referred to example of this, as it’s only in space where we have travelled the sorts of speeds that make this effect at all measurable, and/or where you will find things (like black holes) with enough mass to make a measurable difference.

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