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Question 2:
2. If it took only about a year for the New Horizons spacecraft to travel from Earth to Jupiter (passing Mars’ orbit), why will it take eight years to get from Jupiter to Pluto (passing the orbits of Saturn, Uranus, and Neptune)? Note: The graphic Timeline of New Horizons’ nine-year journey from Earth to Pluto may help you answer this question.
Answer:

As the Timeline of New Horizons’ nine-year journey from Earth to Pluto graphic shows, the distance between Earth and Jupiter is much smaller than the distance between Jupiter and Pluto. The planets are not equally spaced. The farther a planet is from the Sun, the greater the distance to its nearest neighbor. The distance between Jupiter and Pluto is almost nine times greater than the distance between Earth and Jupiter. The added speed of the spacecraft will cut the journey time to eight years.

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