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)