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In this video I will explain the twin paradox. Time paradox is the time experienced by observer B (on space ship at v=0.99c) is different compare to the time experienced by observer A (on Earth). If the voyage takes 70 years in Earth time (observer A) it will take 10 years in observer B (space ship) time.

Just For Fun! - Astronomy (16) The Twin Paradox and Time Dilation
https://youtu.be/5Vgq6wGJRBQ

Next video in this series can be seen at:
https://youtu.be/DChEtvBhfL4