Main Characters
Astrophysicist
152 main appearances
Narrator
126 main appearances
Astronomer
94 main appearances
Astronomer, NASA Goddard Space Flight Center
72 main appearances
Planetary Scientist
27 main appearances
Planetary Protection Engineer
33 main appearances
Astrophysicist / Planetary Scientist, Southwest Research Institute
33 main appearances
Cosmologist / Theoretical Physicist, Arizona State University
28 main appearances
Planetary Scientist and Geologist
26 main appearances