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Astrophysicist and 'StarTalk' host Neil deGrasse Tyson uses the power of Twitter to answer some common questions about our universe. What is a quark? Is there a limit to the expansion of the universe?
Tune into 'StarTalk' airing Sundays at 11pm/10c on National Geographic.
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Neil deGrasse Tyson Answers Science Questions From Twitter | Tech Support | WIRED
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