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Question 1:
Why do you think astronomers are so worried about undetected rings or moons around Pluto?
Answer:

Astronomers are concerned that they might send the New Horizons spacecraft on a collision course with some space debris. They are counting on the spacecraft to send back amazing pictures of our faraway dwarf neighbor, and they do not want New Horizons to be destroyed before it makes its observations of Pluto and other objects in the Kuiper Belt.

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