Distributia
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Sean CarrollHimself - Theoretical Physicist
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Moogega CooperHerself - Planetary Protection Engineer (as Moogega Stricker)
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James S. BullockHimself - Astrophysicist (as James Bullock)
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Mike RoweNarrator (voice)
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Phil PlaitHimself - Astronomer
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Max TegmarkHimself - Physicist
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Michelle ThallerHerself - Astronomer
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Alex FilippenkoHimself - Astrophysicist
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Shep DoelemanHimself - Astronomer
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Hakeem OluseyiHimself - Astrophysicist
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Katie FreeseHerself - Theoretical Physicist (as Katherine Freese)
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Matthew O'DowdHimself - Astrophysicist (as Matt O'Dowd)
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Paul M. SutterHimself - Astrophysicist
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Grant TremblayHimself - Astrophysicist
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Richard LinternSelf - Narrator