Carl Sagan as Himself (archive footage)

John Casani as Himself

Lawrence Krauss as Himself

Carolyn Porco as Herself

Timothy Ferris as Himself

Edward Stone as Himself

Nick Sagan as Himself

Larry Soderblom as Himself

Charley Kohlhase as Himself

Fran Bagenal as Herself

James F. Bell as Himself

Frank Locatell as Himself

Suzanne Dodd as Herself

Jon Lomberg as Himself

Heidi Hammel as Herself

Candy Hansen as Herself

Andrew Ingersoll as Himself

Dave Linick as Himself

Fernando Peralta as Himself

Linda J. Spilker as Herself

Tom Spilker as Himself

Janet Sternberg as Herself

Amahl Drake as Herself

Don Gurnett as Himself

Stamatios Krimigis as Himself

Linda Morabito as Herself

Bradford A. Smith as Self - Imaging Science Team Leader

Richard John Terrile as Himself

Frank Drake as Self