Distributia
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Erik DellumsNarrator (voice) (as Erik Todd Dellums)
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Michio KakuHimself - Theoretical Physicist, City University of New York (as Prof. Michio Kaku)
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Richard LinternHimself - Narrator (voice)
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Geoff MarcyHimself - Astronomer, University of California: Berkley (as Prof. Geoff Marcy)
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Phil PlaitHimself - Astronomer, Discover Magazine (as Dr. Phil Plait)
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Lawrence KraussHimself - Theoretical Physicist, Arizona State University (as Prof. Lawrence Krauss)
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Michelle ThallerHerself - Astronomer, NASA Goddard Space Flight Center (as Dr. Michelle Thaller)
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Juna KollmeierHerself - Astrophysicist, Carnegie Observatories (as Dr. Juna Kollmeier)