• 
  Alan Bean

  Himself - Apollo 12 Astronaut
• 
  Walter Cunningham

  Himself - Apollo 7 Astronaut
• 
  Erik Dellums

  Narrator (as Erik Todd Dellums)
• 
  Leroy Chiao

  Himself - NASA Shuttle Astronaut and ISS Commander
• 
  Andrew Chaikin

  Himself - Historian and Author: 'A Man on the Moon'
• 
  Roger Launius

  Himself - National Air and Space Museum
• 
  Ken Bowersox

  Himself - NASA Shuttle Astronaut and ISS Commander
• 
  Marc D'Antonio

  Himself - Chief Image Analyst - MUFON

• 
  Richard Hoover

  Himself - Former Astrobiologist (as Richard B. Hoover)
• 
  Todd Hoeksema

  Himself - Astronomer (as J. Todd Hoeksema)
• 
  Becky Ferreira

  Herself - Science Writer
• 
  Lucy Dunne

  Herself - Wearable Technology Laboratory, Univ. of Minnesota
• 
  David Aguilar

  Himself - Author and Astronomer
• 
  Brad Holschuh

  Himself - Wearable Technology Laboratory, Univ. of Minnesota
• 
  J.J. Kavelaars

  Himself - Astronomer

• 
  J.J. Kavelaars

  Himself - Astronomer