Distributia
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Mike RoweHimself - Narrator (voice)
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Dan DurdaHimself - Planetary Scientist
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Phil PlaitHimself - Astronomer
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Lawrence KraussHimself - Cosmologist (as Lawrence M Krauss)
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Michelle ThallerHerself - Astronomer
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John SpencerHimself - New Horizons Co-Investigator
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Alan SternHimself - New Horizons Principal Investigator
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Jani RadebaughHerself - Planetary Scientist