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 thatA. 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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