Louise Alexander

Jim Bennett

Jim Bennett

饰：Self - Director: Museum of the History of Science

David Charbonneau

饰：Self - Associate Professor of Astronomy,(as David Charbonneau Ph.D.)

Alex Filippenko

饰：Self - Astrophysicist

Geoff Marcy

饰：Self - Professor of Astronomy

Charles Mattias 'Matt' Mountain

饰：Self - Director: Space Telescope Science Institute,(as Matt Mountain)

杰伊·桑德斯

Jay O. Sanders

饰：Self - Narrator

Albert van Helden

饰：Self - Professor: University of Utrecht,(as Albert Van Helden)

Steven Deproost

Wendy L. Freedman

饰：Self - Director: Carnegie Institution Observatories,(as Wendy Freedman)

Linda Spilker

饰：Self - NASA Scientist,(as Linda Spilker)