What if the moon never had existed?What if the moon never had existed?What if the moon never had existed?
William Hartmann
- Self
- (as Professor William Hartmann)
Jay Melosh
- Self
- (as Professor H. Jay Melosh)
Robin Canup
- Self
- (as Professor Robin Canup)
Marjorie A. Chan
- Self
- (as Professor Marjorie A. Chan)
Jacques Laskar
- Self
- (as Professor Jacques Laskar)
Lynn Rothschild
- Self
- (as Professor Lynn Rothschild)
Minik Rosing
- Self
- (as Professor Minik Rosing)
Norman Sleep
- Self
- (as Professor Norman Sleep)
Jack Lissauer
- Self
- (as Professor Jack Lissauer)
Alan Binder
- Self
- (as Professor Alan Binder)
Madhu Thangavelu
- Self
- (as Professor Madhu Thangavelu)
Nader Khalili
- Self
- (as Professor Nader Kalili)
Anthony Zuppero
- Self
- (as Professor Anthony Zuppero)
Bill Hoeft
- Self
- (as Professor Bill Hoeft)
