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Question 4:
Why do you think it will take such a long time for the New Horizons spacecraft to reach Pluto and the Kuiper Belt?
Answer:

Pluto is farther from the Sun than any of the planets. It is nearly 40 times farther from the Sun than is Earth. The New Horizons spacecraft will travel faster than any previous spacecraft, but it also must travel farther to reach its target. For more information about the New Horizons mission, visit:
http://pluto.jhuapl.edu/education/students.php

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