Charles Conrad
饰：Himself (as Commander Charles 'Pete' Conrad)
Karen Stone
Karen Stone
饰：A&E Narrator
Boris Chertok
饰：Himself (also archive footage)
Dr. Sallie Baliunas
Dr. Sallie Baliunas
饰：Herself
Professor Willy Benz
Professor Willy Benz
饰：Himself
Dr. Donald Black
Dr. Donald Black
饰：Himself
Dr. Natalya Bobina
Dr. Natalya Bobina
饰：Herself
Dr. Athena Coustenis
Dr. Athena Coustenis
饰：Herself
Dr. Francisco Diego
Dr. Francisco Diego
饰：Himself
Farouk Elbaz
Farouk Elbaz
饰：Himself (as Dr. Farouk El-Baz)
Professor Gary Flandro
Professor Gary Flandro
饰：Himself
Imre Friedmann
Imre Friedmann
饰：Himself
Professor Douglas Gough
Professor Douglas Gough
饰：Himself
Dave Grinspoon
Dave Grinspoon
饰：Himself
Dr. Don Gurnett
Dr. Don Gurnett
饰：Himself
Professor Truls Hansen
Professor Truls Hansen
饰：Himself
Bill Hartmann
Bill Hartmann
饰：Himself
Jim Head
Jim Head
饰：Himself
弗雷德·霍伊尔
Fred Hoyle
饰：Himself (archive footage) (as Sir Fred Hoyle)
Linda Hyder
Linda Hyder
饰：Herself
Andy Ingersold
Andy Ingersold
饰：Himself
Sergei Khrushchev
Sergei Khrushchev
饰：Himself (as Professor Sergei Khrushchev)
Joe Kittinger
Joe Kittinger
饰：Himself (also archive footage)
Leonid Ksanfomality
Leonid Ksanfomality
饰：Himself
Professor Hal Levison
Professor Hal Levison
饰：Himself
David Levy
David Levy
饰：Himself (as Dr. David Levy)
Professor Sir Bernard Lovell
Professor Sir Bernard Lovell
饰：Himself
Mike Malin
Mike Malin
饰：Himself
Mikhail Marov
Mikhail Marov
饰：Himself
Professor Michel Mayor
Professor Michel Mayor
饰：Himself
克里斯·麦凯
Chris McKay
饰：Himself
Hap McSween
Hap McSween
饰：Himself
Professor H. Jay Melosh
Professor H. Jay Melosh
饰：Himself
Steve Moises
Steve Moises
饰：Himself
Professor Bruce Murray
Professor Bruce Murray
饰：Himself (also archive footage)
Professor Eugene Parker
Professor Eugene Parker
饰：Himself
Vladimir Perminov
Vladimir Perminov
饰：Himself
Carolyn Porco
Carolyn Porco
饰：Herself (as Professor Carolyn Porco)
Dr. Didier Queloz
Dr. Didier Queloz
饰：Himself
Ray Reynolds
Ray Reynolds
饰：Himself
卡尔·萨根
Carl Sagan
饰：Himself (archive footage) (as Dr. Carl Sagan)
德怀特·戴维·艾森豪威尔
Dwight D. Eisenhower
饰：Himself (archive footage) (uncredited)
尼基塔·谢尔盖耶维奇·赫鲁晓夫
Nikita Khrushchev
饰：Himself (archive footage) (uncredited)
萨缪尔·韦斯特
Samuel West
饰：BBC Narrator
巴兹·奥尔德林
Buzz Aldrin
饰：Himself (archive footage) (uncredited)
Stephen Squyres
Stephen Squyres
饰：Himself
Harrison Schmitt
饰：Himself (as Dr. Harrison Schmitt)
尤里·加加林
Yuri Gagarin
饰：Himself (archive footage) (uncredited)
Wernher von Braun
饰：Himself (archive footage) (uncredited)
Alvin Seiff
Alvin Seiff
饰：Himself
Arnold Selivanov
Arnold Selivanov
饰：Himself
Yuri Silaev
Yuri Silaev
饰：Himself
Brad Smith
Brad Smith
饰：Himself
Larry Soderblom
Larry Soderblom
饰：Himself
Gerry Soffen
饰：Himself
Jerry Soften
Jerry Soften
饰：Himself
Ellen Stofan
Ellen Stofan
饰：Herself
Edward Stone
Edward Stone
饰：Himself (as Dr. Edward Stone)
Yuri Surkov
Yuri Surkov
饰：Himself
Professor James Van Allen
Professor James Van Allen
饰：Himself
Jurrie Van Der Woude
Jurrie Van Der Woude
饰：Himself
Sasa Vasilievski
Sasa Vasilievski
饰：Himself
Professor George Wetherill
Professor George Wetherill
饰：Himself
谢尔盖·帕夫洛维奇·科罗廖夫
Sergei P. Korolev
饰：Himself (uncredited)
Bob Layton
Bob Layton
饰：Himself (archive footage) (uncredited)
William Hartmann
饰：Himself - Planetary Science Institute, Arizona
尼尔·阿姆斯特朗
Neil Armstrong
饰：Himself
Sallie Baliunas
饰：Herself - Mount Wilson Observatory
Willy Benz
饰：Himself - University of Berne
Francisco Diego
饰：Himself - University College London
Gary Flandro
饰：Himself - University of Tennessee
约翰·肯尼迪
John F. Kennedy
饰：Himself
Alexey Leonov
饰：Himself - Cosmonaut
Bernard Lovell
饰：Himself - Director, Jodrell Bank, 1951-1981
James Lovell
饰：Himself
Geoff Marcy
饰：Himself - San Francisco State University
Michel Mayor
饰：Himself - Observatoire de Geneve
H. Jay Melosh
饰：Himself - Lunar and Planetary Laboratory, Arizona
Didier Queloz
饰：Himself - Observatoire de Geneve
Steve Squyres
饰：Himself - Cornell University
James Van Allen
饰：Himself - Univeristy of Iowa
Eugene Cernan
Eugene Cernan
饰：自己
Mark Halliley
Mark Halliley
饰：Self - Narrator