Time is like a movie, when you're moving fast, the frames play slower for you. Imagine riding on a super-fast rocket; to you, everything feels normal, but someone watching from Earth sees your time going by slowly, just like a slowed-down video.
Examples
- A person on a rocket going near the speed of light ages slower than someone standing still.
- A twin who goes on a fast space journey returns to find their sibling has grown old while they've barely aged.
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