Time Dilation: Astronaut Rachel leaves Earth in a spaceship at a speed of 0.960c relative to an observer on Earth. Rachel's destination is a star system 14.4 light-years away (one light-year is the distance light travels in one year). According to Rachel, how long does the trip take?
A. 14 years
B. 15 years
C. 11 years
D. 4.2 years
E. 23 years
Answer: D
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