Twin A makes a round trip at 0.6c to a star 18 light-years away, while twin B stays on the earth. Each twin sends the other a signal once a year by his own reckoning. How many signals does B send during the trip
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Twin A makes a round trip at 0.6c to a star 18 light-years away, while twin B stays on the earth. Each twin sends the other a signal once a year by his own reckoning. How many signals
does B send during the trip
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