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Problem 2 The distance from Earth to Planet X is 3.0 light years (a light-year is the distance that light travels in 1 year),
Problem 2 The distance from Earth to Planet X is 3.0 light years (a light-year is the distance that light travels in 1 year), as measured in the frame of reference in which both Earth and Planet X are at rest. (a) According to observers in the spaceship, the journey from Earth to Planet X takes 7 years. At what speed must the spaceship be travelling? (b) According to observers on the spaceship, what do they estimate for the distance between Earth and Planet X? (c) How long would the trip take according to observers on Earth?
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