A star 15 light-years away, the twin sister makes a round trip in a spacecraft with a speed of 0.6c and returns to Earth
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A star 15 light-years away, the twin sister makes a round trip in a spacecraft with a speed of 0.6c and returns to Earth
A star 15 light-years away, the twin sister makes a round trip in a spacecraft with a speed of 0.6c and returns to Earth. (Ignore the time the twin sister stayed on the planet.) When you meet again with your twin sister who remains on Earth, what will be the age of the twin sister and the older sister? (The two broke up when they were 20.)
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