character: Albert Einstein
topic: The Cosmological Constant and its implications in physics
grade: 12
subject: Physics
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character: Edwin Hubble
topic: Observational evidence for an expanding universe
grade: 12
subject: Physics
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character: Nicolas Copernicus
topic: Historical context of cosmology before Einstein
grade: 12
subject: Physics
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character: Stephen Hawking
topic: Theories on dark energy and its role in the universe's expansion
grade: 12
subject: Physics
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