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What are 'Saturn's ears"?In what year was Pluto discovered?Which famous astronomer was the first person to see Jupiter's moons?Find out the answers to these questions and much more, in this fascinating look at outer planets! Read about mankind's quest to understand more about Uranus, Neptune, Jupiter and Saturn, as well as Pluto and the Kuiper Belt. And, through various hands-on activities and problem-solving exercises, you can learn how to solve difficult questions about the outer planets in the way that astronauts and scientists do.