David J. Helfand
饰:Himself - Quest University, Canada
Phil Plait
饰:Himself - Astronomer
Michelle Thaller
饰:Herself - Phd., astronomer, NASA Goddard Space Flight Center
Geoff Marcy
饰:Himself - University of California Berkeley
Bob Ballard
饰:Self - Oceanographer
Seth Shostak
饰:Self - SETI Institute
Fritz Coleman
饰:Self - Weather Forecaster, KNBC
Rosaly Lopes
饰:Self - Senior Research Scientist, JPL
Lynn Rothschild
饰:Self - NASA Ames Research Center
Russell Schweickart
饰:Self - Apollo 9 astronault
H. Jay Melosh
饰:Self - Planetary scientist, University of Arizona
乔治欧·A·索卡洛斯
Giorgio A. Tsoukalos
饰:Self - Publisher, Legendary Times Magazine
John Cornett
饰:Self - National Solar Observatory
Ed Krupp
饰:Self - Griffith Observatory
Ed Moses
饰:Self - National Ignition Facility