Physics

Luka

26 September, 12:37

Twin sisters, Gwen and Jackie, were both 20 years old in the year 2000. Jackie took off on a round trip to Vega, 25 light years away. She traveled at an average speed very close to the speed of light-say, 0.9999c. According to Gwen back on Earth, about how long does it take Jackie to reach Vega?

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