character: NASA Administrator
topic: SpaceX and the Commercial Crew Program: A New Era in Space Travel
grade: 9
subject: Physics
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character: SpaceX Engineer
topic: The Engineering Challenges of Reusable Rockets
grade: 9
subject: Physics
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character: NASA Astronaut
topic: Training for Commercial Crew Missions: Living and Working in Space
grade: 9
subject: Physics
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character: Physics Teacher
topic: Understanding Gravity and thrust: The Science Behind Space Travel
grade: 9
subject: Physics
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