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Key Facts In This Video
Time dilation makes your time pass more slowly. Two things can cause it: moving fast relative to people looking at you, and high-level gravity. 00:43
Earth's surface has a higher gravity than Mars' surface, so you'll live your seconds faster on Mars than on Earth. 01:35
Because satellites are further from Earth's surface than we are, they experience less gravity so their clocks move faster. We pre-correct for this. 01:48