Peggy is an astronaut and volunteers for the first manned mission to Alpha Centa

Question

Peggy is an astronaut and volunteers for the first manned mission to Alpha Centauri, the nearest star system to the Solar System. Her spacecraft will travel at 80% of the speed of light, and the trip there and back will take over 10 years. Her twin sister Patty is an astronomer and will remain on Earth, studying Alpha Centauri using telescopes. When Peggy returns from her trip, how will their ages compare?

-Patty will be older than Peggy

-Peggy and Patty will still be the same age

-Patty will be younger than Peggy

Explanation / Answer

PATTY WILL BE OLDER THAN PEGGY.

because when a spaceship travels at speeds quite comparable to the speed of light, time dilation takes place in the spaceship.

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