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Unknown, 2008
Current format, Unknown, 2008, Revised & updated, All copies in use.
Unknown, 2008
Current format, Unknown, 2008, Revised & updated, All copies in use. Offered in 0 more formats
What are comets and where do they come from? Why do we need to study asteroids? What are meteor showers? Find the answers in this book! Some comets take thousands of years to move once around the Sun. But Halley's Comet comes by every 76 years. Learn where billions of comets hang out in space.
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