Reparto (por orden de créditos)
Mike Rowe
Self - Narrator(voice)
Dan Durda
Self - Planetary Scientist
Michio Kaku
Self - Theoretical Physicist
Lawrence Krauss
Self - Cosmologist
Amy Mainzer
Self -Astronomer
Chris McKay
Self - Astrobiologist
Phil Plait
Self - Astronomer
Michelle Thaller
Kevin Walsh