Guest Stars Grant Tremblay as Himself (Astrophysicist) Amber Straughn as Herself (Astrophysicist) Alex Filippenko as Himself (Astrophysicist) Chiara Mingarelli as Herself (Astrophysicist) Gibor Basri as Himself (Astrophysicist) Phil Hopkins as Himself (Theoretical Astrophysicist)