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4.1 Overview
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4.2 Circular Orbits (3 Questions)
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4.3 Kepler's Laws of Planetary Motion (3 Questions)
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4.4 Orbital Energy and Escape Velocity (3 Questions)
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4.5 Orbital Altitude and Inclination
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4.6 Implications for Spaceflight (5 Questions)
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5.1 Overview
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5.2 The World of Microgravity (2 Questions)
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5.3 The Heart and Circulatory System (2 Questions)
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5.4 The Musculoskeletal System (1 Question)
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5.5 The Brain and Neurophysiological System (1 Question)
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5.6 Space Radiation (3 Questions)
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