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Suppose Amelia traveled at a speed of 0.80c to a star that (according to Casper on...

Suppose Amelia traveled at a speed of 0.80c to a star that (according to Casper on Earth) is 8.0 light-years away. Casper ages 20 years during Amelia’s round trip. How much younger than Casper is Amelia when she returns to Earth?

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