Question

One twin sets off on a long space voyage traveling at 0.9 c, while the other stays on Earth. When she returns 60 years later, the traveling sister has hardly aged at all, while her twin has aged 60 years. What aspect of relativity is demonstrated in this situation?

A. length contraction

B. mass-energy equivalence

C. time dilation

D. mass increase

Answer 1

it is the time dilation

Answer 2

and that experiment is the twin paradox

Answer 3

ohh okay! thanks :)

Answer 4

:)