William Hartmann
Reparto
William Hartmann conocido por su papel en Cosmic Collisions (2009), Future Flight (1987) y UFOs: The Secret History (2010).
Reparto
- 2010La historia del universoSelf - Planetary Scientist
- 2010UFOs: The Secret HistorySelf
- 2010UFOs: The Secret History Part 2 - The Extraterrestrial HypothesisAstronomer, Artist; University of Arizona
- 2009Así se hizo la TierraSelf - Planetary Scientist, Planetary Science Institute, Arizona
- 2008CatastropheSelf
- 2007El universoSelf - Planetary Science Center
- 1999Si no tuviéramos la lunaSelf
- 1999The PlanetsSelf - Planetary Science Institute, Arizona
- 1964HorizonSelf