Neil deGrasse Tyson
Self
Acting
Bill Nye
Self
Acting
Michio Kaku
Self
Acting
Jim Lovell
Self
Acting
Gene Kranz
Self
Acting
Lawrence Krauss
Self
Acting
Robert Zubrin
Self
Acting
Leroy Chiao
Self
Acting
Story Musgrave
Self
Acting
Rick Tumlinson
Self
Acting
Marcia Smith
Self
Acting