Physics question:relativity

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A spaceship leaves our solar system at a constant speed of 0.920and travels to a point in the Andromeda galaxy. According to astronomers in an inertial reference frame on Earth, the distance to the galaxy is 2.081 × 1022 m. What distance does the crew on the ship measure on its journey?
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Jul 9th, 2015

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d'= 2.081 * 10^ 22 m
d = ?
gamma = 1/ Sqrt( 1-0.920^2)  = 2.55

we know that d = d' / (gamma)
d = 2.081 * 10^ 22 / 2.55  = 8.155 x 10^21

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