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Seymour Simon

Publisher: HarperCollins PublishersFormat: Paperback

Seymour Simon has written more than 150 award-winning science books about animals, anatomy, astronomy, earth science, and vehiclesNamed after the Roman god of war, Mars has fascinated people for thousands of years. Did you know that . . .A Martian year is 687 Earth days, almost twice as long as a year on Earth.Mars's biggest valley, Valles Marineris, is four times as deep as the Grand CanyonScientists think that Mars, now rocky and barren, once had an ocean, rivers, and a thicker atmosphere.The first robot ever to explore the surface of Mars is only about the size of a child's toy wagon.

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