Question

<Elementary Physics>

Look up the “twin paradox” and answer the following questions: Imagine one of your friends is a flight attendant and spends five years flying around in jet planes. By how much will your friend’s age be different than it would have been if the friend had spent that time hanging out at home. Older or younger? Now imagine the same but for a friend who is on the International Space Station for five years? (In detail this question is weird because flights and space stations go around the Earth, not out and back. But just do the calculation as if your friend just went out and back. The answer you get is close to the true answer.) Now imagine the same but for a friend who spends five years on a journey to a distant star, traveling at 0.2 c. Now the same but 0.99 c. Here you might want to say how much has your friend aged, instead of the correction to the age.

Answer 1