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The distance to a particular star, as measured in the earth's frame of reference, is 7.11 light-
years (1 light-year is the distance that light travels in 1 y). A spaceship leaves the earth and
takes 3.35 y to arrive at the star, as measured by passengers on the ship. (a) How long does
the trip take, according to observers on earth? (b) What distance for the trip do passengers
on the spacecraft measure?

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