character: NASA
topic: Impact of Microgravity on Human Physiology
grade: 9
subject: Science
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character: Astronauts
topic: Physiological Changes in Space Flight
grade: 9
subject: Science
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character: Space Agencies
topic: Research on Bone Density Loss in Microgravity
grade: 9
subject: Science
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character: Medical Researchers
topic: Cardiovascular Effects of Long-Duration Space Missions
grade: 9
subject: Science
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