On screen
Cast
25 credited performers
Mike Rowe
Narrator
Michelle Thaller
Herself
Phil Plait
Character not listed
Artwork unavailable
Nina Lanza
Character not listed
Hakeem Muata Oluseyi
Self - Astrophysicist
Artwork unavailable
Moogega Cooper
Self - Planetary Protection Engineer
Artwork unavailable
Jani Radebaugh
Self - Planetary Scientist
Dan Durda
Character not listed
Kevin J. Walsh
Character not listed
Artwork unavailable
Paul M Sutter
Self - Astrophysicist
Erik Dellums
Self - Narrator
Artwork unavailable
Chris Mckay
Self - Astrobiologist
Carly Howett
Self - Planetary Scientist
Artwork unavailable
Amber Straughn
Self - Astrophysicist
Artwork unavailable
Max Tegmark
Self - Theoretical Physicist
Artwork unavailable
Alex Philippenko
Self - Astrophysicis
Artwork unavailable
Katie Freese
Self - Cosmologist
Artwork unavailable
Grant Tremblay
Self - Astrophysicist
Artwork unavailable
Chiara Mingarelli
Self - Astrophysicist
James S. Bullock
Character not listed
Lawrence Krauss
Himself
Michio Kaku
Himself
Albert Einstein
Himself (Archive footage)
Clifford V. Johnson
Self - Theoretical Physicist
Richard Lintern
Himself - Narrator