What's the paradox, you ask:
The paradox has been described using the analogy of twins: If one twin is placed on a spacecraft traveling near the speed of light while the other twin remains earthbound, the unmoved twin would have aged dramatically compared with his interstellar sibling. That time slows on moving objects has been documented through repeated experimentation. But the paradox is the earthbound twin is the one who would be considered to be in motion -- in relation to the sibling -- and therefore should be the one aging more slowly.
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