What is a useful result of the discovery that Charon occasionally eclipses Pluto?
A. It showed that eclipses occur in other parts of the Solar System.
B. It allowed astronomers to image surface features of Pluto.
C. It allowed astronomers to measure the distance between Pluto and Charon.
D. It allowed astronomers to determine the size of Pluto and Charon more accurately.
Answer: D
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a.
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b.
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c.
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