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? Peggy and Patty will still be the same age. Peggy will be older than Patty. Peggy will be younger than Patty.

Explanation / Answer

Peggy will be younger than Patty

This will be because of the time-dilation effects , time appear to move slower near massive objects because the objects gravitational force bends space time,

Another factor that come under consideration is relative velocity time dilation, where time moves slower as you move faster

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