On their 30th birthday Helen departs on a starship voyage wh

On their 30th birthday, Helen departs on a starship voyage which travels at 0.95c to a distant star, that is 19 light years from earth. Upon arriving, she immediately turns around and heads home at 0.95c. a) How old George will be when his sister returns? and b)how old will be Helen when she returns?

Solution

Distance travelled=38 light years

Speed=0.95c

Time=38light years/0.95c

T=(9.461×10¹⁵)/(0.95×3×10⁸)

T=3.3196×10⁷ seconds =1.05263825469 years

Both will be 31.05263825469 years old

Or

31 years 19 day 5hr 6min 40 sec old