Question

Asked Apr 29, 2019

Pretend you are on a space ship traveling at 90% the speed of light and travel to a star that is 10 light years away. If, when you left Earth, you had a twin brother or sister, how much younger would you be upon your return?

A: 13.5 years younger

B: 6.75 years younger

C: 10 years younger

D: You would still be the same age

Step 1

According to brother on Earth, the time that twin brother in motion will take to reach back Earth can be calculated as follows.

Step 2

Thus, the brother in Earth will be 22.22 year older at the reunion.

According to brother in motion, the time that he will take to come back to Earth can be calculated as follows.

Step 3

This indicates that brother in motion will be 9.68 year older at the time of reunion.

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