Roger Tilling

饰：自己

Phil Plait

饰：Self

Jeff Hester

Jeff Hester

饰：Self

Michael Izquierdo

Michael Izquierdo

饰：Narrator

Eugene Shoemaker

饰：Self,(archive footage)

John M. Grunsfeld

饰：Self

Eric Chaisson

饰：Self

Heidi Hammel

饰：Self