character: Dr. Emily Foster
topic: Understanding Stellar Classification
grade: 9
subject: Science
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character: Professor Alan Hart
topic: The Basics of Stellar Evolution
grade: 9
subject: Science
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character: Ms. Sarah Lee
topic: Introduction to Spectroscopy
grade: 9
subject: Science
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character: Dr. John Smith
topic: The Hertzsprung-Russell Diagram Explained
grade: 9
subject: Science
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