Guest Stars Amber Straughn as Herself (Astrophysicist) Alex Filippenko as Himself (Astrophysicist) Jessie Christiansen as Herself (Astrophysicist) Gibor Basri as Himself (Astrophysicist) Aomawa L. Shields as Herself (Astronomer) Kathryn Bywaters as Herself (Astrobiologist) Andrew Pontzen as Himself (Cosmologist) Phil Hopkins as Himself (Theoretical Astrophysicist)
