Why when I travel at near light speed and return to Earth has more time passed there than for me?

Why when I travel at near light speed and return to Earth has more time passed there than for me?
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Yes. In a documentary hosted by Brian Cox, I think, it was said that a total amount of energy is available to an object travelling through space and time. The more energy you spend on an object moving through spatial dimensions, by accelerating it, the less energy is available for movement through the dimension of time, making the passage of time slower for the travelling object.
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