Guest Stars Chiara Mingarelli as Herself (Astrophysicist) Jessie Christiansen as Herself (Astrophysicist) Sarafina El-Badry Nance as Herself (Astrophysicist) Carly Howett as Herself (Planetary Scientist) Lewis Dartnell as Himself (Astrobiologist) Phil Hopkins as Himself (Theoretical Astrophysicist) Konstantin Batygin as Himself (Planetary Astrophysicist)
