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The distance to a particular star, as measured in the earth's frame of reference, is 7.25 ly (1 light year is the distance light travels

The distance to a particular star, as measured in the earth's frame of reference, is 7.25 ly (1 light year is the distance light travels in 1 y). A spaceship leaves Earth headed for the star, and takes 3.96 y to arrive, as measured by passengers on the ship. What distance for the trip do passengers on the spacecraft measure? (Hint: What is the speed of light in units of ly/y?)

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