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Mike Rowe
Narrator
Phil Plait
Self - Astronomer
Michelle Thaller
Self - Astronomer
Hakeem Muata Oluseyi
Self - Astrophysicist
Nina Lanza
Self - Planetary Scientist
Moogega Cooper
Self - Planetary Protection Engineer
Jani Radebaugh
Self - Planetary Scientist
Chris Mckay
Self - Astrobiologist
Dan Durda
Self - Planetary Scientist
James S. Bullock
Self - Astrophysicist
Carly Howett
Self - Planetary Scientist
Paul M Sutter
Self - Astrophysicist
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