Guest Stars Amber Straughn as Herself (Astrophysicist) Meenakshi Wadhwa as Herself (Planetary Scientist) Max Tegmark as Himself (Theoretical Physicist) Chris McKay as Himself (Astrobiologist) Caleb Scharf as Himself (Astrobiologist) Lewis Dartnell as Himself (Astrobiologist) David Kipping as Himself (Astronomer, Harvard-Smithsonian Center for Astrophysics)
