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Explore comets and asteroids with these flashcard sets exclusively from Astronomy magazine. Blazing trails through our solar system, these intriguing objects orbit the Sun and were formed billions of years ago. These unique flashcard sets dive into the details with 36 cards in each set. Each of the 10-centimeter (4-inch) × 15-centimeter (6-inch) cards features interesting facts, amazing details, and stunning photos of various comets and asteroids.