Multiple Choice
Two twin sisters,Gwen and Jackie,are both 20 years old in the year 2020.Jackie takes off on a round-trip to Vega,25 light-years away.She travels 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?
A) about a month
B) about 10 years
C) about 25 years
D) about 100 years
Correct Answer:
Verified
Correct Answer:
Verified
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