character: Main Sequence Star
topic: Stable Phase in Stellar Evolution
grade: 9
subject: Science
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character: Hydrogen Fusion
topic: Energy Production in Main Sequence Stars
grade: 9
subject: Science
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character: Hertzsprung-Russell Diagram
topic: Classification of Stars and Main Sequence Phase
grade: 9
subject: Science
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character: Stellar Lifecycle
topic: Phases of Stellar Evolution Including Main Sequence
grade: 9
subject: Science
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