Guest Stars Ben Oppenheimer as Himself (Astrophysicist) John Asher Johnson as Himself (Astronomer) Evgenya Shkolnik as Herself (Astronomer) Chris McKay as Himself (Astrobiologist) David Kipping as Himself (Astronomer, Harvard-Smithsonian Center for Astrophysics) Keivan Stassun as Himself (Phd., Physics and Astronomy) Heather A. Knutson as Herself (Assistant Professor of Planetary Science)
