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