Lee and Leigh are twins. At their first birthday party, Lee is placed on a spaceship that travels away from the earth and back at a steady 0.866c. The spaceship eventually returns, landing in the swimming pool at Leigh’s eleventh birthday party. When Lee emerges from the ship, it is discovered that
A. He is still only 1 year old.
B. He is 6 years old.
C. He is also 11 years old.
D. He is 21 years old.
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