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Time is an arbitrary creation by humans based on the movement of our Sun and our planet. We could have decided that the movement of our sun in our sky would be divided into 100 increments of time and called these hours...but we decided on 24 for reasons unknown to me.
All time is equal everywhere. If for some reason you are 2 billion light years away on some remote planet...you will age just as fast as someone on Earth. However once we find a way to travel faster than light (impossible according the Einstein), we can experience time in a different way. Someone could travel faster than light thousands of times around our galaxy in a short period of time and then return to Earth where they realize a hundred years have passed. I'm not sure how to explain this to you but it makes sense if you can find somewhere that explains this. So this is a way of traveling into the future...traveling to the past however is probably unlikely.
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