The twin Julia and John are $30$ years old. on their birthday Julian leaves on a return trip to a star $15$ light years from earth. her spaceship maintains a speed of $0\mathrm{.}6$c relative to earth. they arrange to send radio signal to each other each year on their birthday$($ according to their own time and calendar$).$ Make use of doppler effect equations  and determine how many signals Julian would have received from John as she returns to earth. How this relate to John's age?

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To answer this question we need to first understand the effect of relativity on time and space and t... View the full answer