Hakeem Oluseyi

饰：Himself - Astrophysicist

Dimitra Jiova

饰：Damla

Roberta Setzu

饰：Lisa Martines

Dean Morrison Madera

饰：School Student

Leslie Garza

饰：Co-worker 2

Anthony D. Call

饰：Self - Narrator

Alan Dean Foster

饰：Self - Author

大卫·布林

David Brin

饰：Self - Astronomer, Author

Kevin R. Grazier

饰：(as Kevin Grazier)

Jeffrey L. Bada

饰：(as Jeffrey Bada)

Charles Campos

饰：(as Charles Campos)

Ray Chao

Ray Chao

饰：Chief Asian Astronomer

Nicole Nasca Supercinski

Nicole Nasca Supercinski

饰：(as Nicole Nasca Supercinski)

Seth Shostak

饰：Self - Senior Astronomer, SETI Institute

David Gerrold

饰：Self - Author

James Clayton

James Clayton

饰：(as James D Thomas)

Gene Richards

Gene Richards

饰：Patient