What is the Biggest Flaw in the Big Bang Theory?
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41:05
What's Really Inside Empty Space?
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32:44
The Closest We’ve Come to a Theory of Everything
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38:30
Why Is The Universe Out Of Balance?
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31:59
The Five Things Keeping Us From Mars
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39:25
Where Does EVERYTHING Come From? - Ask a Spaceman!
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53:46
Particles Unknown: Hunting Neutrinos | Full Documentary | NOVA | PBS
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33:08
Why is it so hard to return to the moon?
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37:36