Distributia
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Idan GinsburgHimself - Astrophysicist
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Dan DurdaHimself - Planetary Scientist
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James S. BullockHimself - Astrophysicist (as James Bullock)
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Dirk TerrellHimself - Astrophysicist
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Larry MolnarHimself - Astronomer
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Mike RoweHimself - Narrator (voice)
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Phil PlaitHimself - Astronomer
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Lawrence KraussHimself - Cosmologist (as Lawrence M Krauss)