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Space & Time

From black holes and dark matter to multiple theories of time, scientists have discovered many mysterious forces in the universe. Learn how the universe began, why planets orbit stars, and how gravity can make things move faster or slower. Meet the great thinkers and scientists who have studied where our universe came from and where it's going. Extraordinary photos and real-world examples invite readers to discover the world of physics, while final comprehension questions engage them to check what they have learned.