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Carl Sagan
Himself (archive footage)

John Casani
Himself

Lawrence Krauss
Himself

Carolyn Porco
Herself

Timothy Ferris
Himself

Edward Stone
Himself

Nick Sagan
Himself

Larry Soderblom
Himself

Charley Kohlhase
Himself

Fran Bagenal
Herself

James F. Bell
Himself

Frank Locatell
Himself

Suzanne Dodd
Herself

Jon Lomberg
Himself

Heidi Hammel
Herself

Candy Hansen
Herself