Time Dilation: At age 21, you set out for a star that is 50 light-years from Earth. How fast would your spaceship have to travel in order to reach that star when you are 61 years old? One light-year is the distance light travels in one year.
A. 0.58c
B. 0.68c
C. 0.78c
D. 0.88c
E. 0.96c
Answer: C
Physics & Space Science
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