Erik Thompson
Self - Narrator
Alex Filippenko
Self - Astrophysicist, Univ. of California, Berkeley
Laura Danly
Self - Astronomer, Curator of Griffith Park Observatory
Alex Filippenko
Self - Univ. of California, Berkeley
Laura Danly
Self - Astronomer, Griiffith Observatory
Alex Filippenko
Self - Astrophysicist, UC Berkeley
Laura Danly
Self - Griffith Observatory
Greg Laughlin
Self - Univ. of California, Santa Cruz
Sean Carroll
Self - Caltech
Travis Taylor
Self - Physicist
Chris McKay
Ames Research Center
Rob Roy Britt
Self - livescience.com
Lucianne Walkowicz
Self - Princeton University
Clifford V. Johnson
Self - Univ. of Southern California
Michael Mischna
Self - JPL
Sean Carroll
Self - Astrophysicist, Caltech
Neil deGrasse Tyson
Self - American Museum of Natural HJistory
Holly Gilbert
Goddard Space Flight Cntr.
Michio Kaku
Self - Author, 'Parallel Worlds'
Travis Taylor
Sci-Fi Author
Rob Roy Britt
Self - Livescience.com
Michio Kaku
Self - Author, 'Physics of the Impossible'
Michelle Thaller
Self - CalTech
Clifford V. Johnson
Self - Physicist, USC
Greg Laughlin
Self - University of California, Santa Cruz
Neil deGrasse Tyson
Self - American Museum of Natural History
Greg Laughlin
Self - Astrophysicist, Univ. of California, Santa Cruz
Chris McKay
Self - Astrobiologist
Don Yeomans
Jet Propulsion Laboratory
Holly Gilbert
Goddard Space Flight Center
Michio Kaku
Self - City College, New York
Chris McKay
Self - NASA Ames Research Center
Clifford V. Johnson
Self - Physicist, Univ. of Southern California
Kevin R. Grazier
Self - Planetary Scientist
Sean Carroll
Self - Astronomer, Cal Tech
Neil deGrasse Tyson
Self - Astrophysicist, American Museum of Natural History
Michael Mischna
Self - NASA
Michelle Thaller
Self - Caltech