A starship sets out on a journey to a distant star which is 7 light-years away...

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A starship sets out on a journey to a distant star which is 7 light-years away from Earth, but on the way there they realize that they forgot a screwdriver so upon arrival immediately return to Earth. They travel at a constant speed during the entire round-trip. (a) If according to Earth-bound observers the round trip takes 20 years, how much time will have elapsed according to the passengers? What total distance will the passengers say that they traveled? (b) If according to passengers on the ship the round trip takes 7 years, how much time will have elapsed according to the Earth? What total distance will the passengers say that they have traveled? A starship sets out on a journey to a distant star which is 7 light-years away from Earth, but on the way there they realize that they forgot a screwdriver so upon arrival immediately return to Earth. They travel at a constant speed during the entire round-trip. (a) If according to Earth-bound observers the round trip takes 20 years, how much time will have elapsed according to the passengers? What total distance will the passengers say that they traveled? (b) If according to passengers on the ship the round trip takes 7 years, how much time will have elapsed according to the Earth? What total distance will the passengers say that they have traveled?