character: Stephen Hawking
topic: Cosmology and the Nature of the Universe
grade: 9
subject: Science
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character: Carl Sagan
topic: Cosmic Perspective on the Universe
grade: 9
subject: Science
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character: Neil deGrasse Tyson
topic: Understanding Cosmic Structure and Scale
grade: 9
subject: Science
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character: Albert Einstein
topic: Theories of Relativity and Cosmic Exploration
grade: 9
subject: Science
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