Anna boards a spaceship and does an interstellar flight while her twin brother, Carlos waits on Earth. Anna’s ship travels at β = 0.80 and, according to Carlos, is gone for 10 years. According to Anna, how long was she gone?
A. 3.0 years
B. 6.0 years
C. 10. years
D. 16 years
E. 19 years
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