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.c. according to gwen back on earth, about how long does it take jackie to reach vega?
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Twin sisters, gwen and jackie, were both 20 years old in the year 2000. jackie took off on a round t...
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