Guest Stars Sarafina El-Badry Nance as Herself (Astrophysicist) Chiara Mingarelli as Herself (Astrophysicist) Jessie Christiansen 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)
