A 27 year-old biologist makes a trip to study lifeforms in a distant planet 17 light-years away. The round tripincluding a stay of 1 year in the distant planet takes 38 yearsaccording to the clock on earth. The biologist's son is 4.0year-old when she left. Assume that the planet is not moving withrespect to earth. How fast is the spaceship traveling? Give youranswer in terms of the speed of light. You do not need to enter "c"as unit.
How old is she when she returns according toher clock?
How old is her son according to the clock onearth?
What is the total distance traveled accordingto the biologist? Give your answer in light-years.