An observer on planet 1 watches a spaceship travel at v = 0.95 c from planet 1 to planet 2. Take the two planets to be at rest with respect to each other. If the person on the spaceship measures the duration of the trip to be 15 years, what distance between the planets does the observer on planet 1 measure? (a) 45.6 lyrs (b) 54.8 lyrs (c) 76.2 lyrs (d) 93.4 lyrs
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