Scientists believe time is relevent so if you have two people, one stays on Earth but the other jumps in a spaceship an travels for five years, when they get back to earth that person would still be the same but person who stayed on earth would 50 years older, so what if the person in the spaceship traveled for 1000 years, then what? Maybe the UFO's we see are the people from the future, if any of that makes any sense.
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