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7:24

Cosmos - Carl Sagan - 4th Dimension

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4.2M views

0:59

Carl Sagan teaching students about the Milky Way galaxy

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524K views

3:31

Carl Sagan - Pale Blue Dot

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7.9M views

0:39

Who Speaks For Earth?

carlsagandotcom

61K views

0:42

If we are not able to ask skeptical questions..

carlsagandotcom

64K views

3:51

Carl Sagan - Cosmos - Democritus

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197K views

4:32

Carl Sagan - Cosmos - Traveling - Speed of Light

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300K views

0:37

Laws of Nature

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35K views

8:46

HOW EVOLUTION HAPPENED BY CARL SAGAN

AstroEye

7.6K views