David Attenborough
Narrator (archive sound)
Sean Carroll
Narrator (archive sound)
Craig Childs
Narrator (archive sound)
Brian Cox
Narrator (archive sound)
Alex Filippenko
Narrator (archive sound)
Stephen Hawking
Narrator (archive sound)
Michio Kaku
Narrator (archive sound)
Lawrence Krauss
Narrator (archive sound)
Janna Levin
Narrator (archive sound)
Phil Plait
Narrator (archive sound)
Martin Rees
Narrator (archive sound)
Mike Rowe
Narrator (archive sound)
Michelle Thaller
Narrator (archive sound)
Neil deGrasse Tyson
Narrator (archive sound)
