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3. (Fully graded) A spaceship travels to a star 8 light-years away, in a time its crew considers to be 8 years. What is the ships speed? (From a GRE exam)
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Answer #1

Since light year is the distance travelled by the light in one year and since the star is 8 light years away that means it would have taken light to reach the star 8 years. Which is exactly the time taken by the spaceship. Hence the spaceship moved with the speed of light. C.

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