Les Clés de l'Univers

Mike Rowe

Himself - Narrator

Michelle Thaller

Self - Astronomer

Phil Plait

Self - Astronomer

Nina Lanza

Self - Planetary Scientist

Hakeem Muata Oluseyi

Self - Astrophysicist

Moogega Cooper

Jani Radebaugh

Self - Planetary Scientist

Dan Durda

Kevin J. Walsh

Paul M Sutter

Self - Astrophysicist

Erik Dellums

Self - Narrator

Chris Mckay

Self - Astrobiologist

Carly Howett

Self - Planetary Scientist

Amber Straughn

Self - Astrophysicist

Max Tegmark

Self - Theoretical Physicist

Alex Philippenko

Self - Astrophysicis

Katie Freese

Self - Cosmologist

Grant Tremblay

Self - Astrophysicist

Chiara Mingarelli

Self - Astrophysicist

James S. Bullock

Self - Astrophysicist

Lawrence Krauss

Himself

Michio Kaku

Himself

Albert Einstein

Himself (Archive footage)

Clifford V. Johnson

Self - Theoretical Physicist

Richard Lintern

Himself - Narrator

Amy Reines

Self - Astronomer