The distance from earth to the center of our galaxy is
Chapter , Problem 10(choose chapter or problem)
The distance from earth to the center of our galaxy is about 23 000 ly (1 ly 5 1 light-year 5 9.47 3 1015 m), as measured by an earth-based observer. A spaceship is to make this journey at a speed of 0.9990c. According to a clock on board the spaceship, how long will it take to make the trip? Express your answer in years (1 yr 5 3.16 3 107 s).
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