尼尔·德格拉塞·泰森

Neil deGrasse Tyson

Janna Levin

饰：Self - Narrator,

基普·索恩

Kip Thorne

饰：Self - California Institute of Technology

Peter Galison

饰：Self - Harvard University

Marcia Bartusiak

饰：Self - Massachusetts Institute of Technology

Paul Murdin

饰：Self - Institute of Astronomy, University of Cambridge