Time on Earth And Time In Space Is Not Same, But Why?

Imagine you have two clocks, one on Earth and one on a spaceship orbiting far from Earth. You might think they both tick at the same speed, but according to science, but that's not true! This is because of something called Einstein's theory of relativity. time isn't always constant. It can actually run a little slower or faster depending on two things: gravity and how fast something is moving.
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