Cosmology and Astronomy - A Universe Smaller than the Observable
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12.5 hours of video
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Summary
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Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/science/cosmology-and-astronomy/universe-scale-topic/big-bang-expansion-topic/v/a-universe-smaller-than-the-observable
A Universe Smaller than the Observable
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