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Explorations An Introduction to Astronomy, 3/e
Thomas T. Arny
The Outer Planets

Essay



1

Why do some astronomers think that Pluto should not properly be considered a planet? Do you agree?
2

If Jupiter were moved closer to the Sun, what do you think would happen to it?
3

Why is it not surprising that Uranus and Neptune have proportionally less hydrogen than their more massive companions, Jupiter and Saturn?
4

Why do the relatively uncratered surfaces of Europa and Enceladus imply that these moons may have been “active” recently?








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