Learn About Outer Space

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Outer space is the closest natural approximation of a perfect vacuum. It has effectively no friction, allowing stars, planets and moons to move freely along ideal gravitational trajectories. However, even in the deep vacuum of intergalactic space there are still a few hydrogen atoms per cubic meter.

My Book of Space

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The Planets in Our Solar System (Let's-Read-and-Find-Out Science, Stage 2)

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Eye Wonder: Space (Eye Wonder)

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jeffryv

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The Magic School Bus: The Secrets of Space

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Space: From Earth to the Edge of the Universe

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