Calificación
Reparto

Carl Sagan
Self (archive footage)

John Casani
Self

Lawrence Krauss
Self

Carolyn Porco
Self

Timothy Ferris
Self

Edward Stone
Self

Nick Sagan
Self

Larry Soderblom
Self

Charley Kohlhase
Self

Fran Bagenal
Self

James F. Bell
Self

Frank Locatell
Self

Suzanne Dodd
Self

Jon Lomberg
Self

Heidi Hammel
Self

Candy Hansen
Herself