character: Astrophysicist
topic: Galactic Dynamics in Spiral Galaxies
grade: 12
subject: Physics
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character: Cosmologist
topic: Formation of Spiral Galaxies
grade: 12
subject: Physics
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character: Astronomer
topic: Characteristics of Spiral Galaxies
grade: 12
subject: Physics
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character: Theoretical Physicist
topic: Interstellar Interactions in Spiral Galaxies
grade: 12
subject: Physics
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