character: Professor Mark Johnson
topic: Understanding Stellar Classification
grade: 9
subject: Science
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character: Dr. Emily Zhao
topic: Introduction to Spectroscopy in Astronomy
grade: 9
subject: Science
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character: Professor Alan Carter
topic: The Hertzsprung-Russell Diagram Explained
grade: 9
subject: Science
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character: Dr. Linda White
topic: Types of Stars and Their Lifecycles
grade: 9
subject: Science
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