A spaceship travels to a distant star at relativistic speed. As measured by observers on Earth, the trip takes 1.8 years and covers a distance of 1.5 light years. Which of the following statements about the distance to the star is correct? The proper length is longer than 1.5 light years. The proper length is equal to 1.5 light years. The proper length is shorter than 1.5 light years.

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