Rowe, Mike, 1962- narrator.

Marsh, Stephen (Producer), producer.

Carter, Stuart producer.

Gasek, Paul. producer.

Say, Louise V. director.

Chinn, Peter. director

Townend, Lorne. director.

Trevisick, Shaun. director.

Discovery Channel (Firm)

Pioneer Productions.

Discovery Communications, Inc.

Gaiam Americas, Inc.

directed by Louise V. Say directed by Peter Chinn ; produced by Martin Mortimore directed by Louise V. Say directed by Peter Chinn

directed by Lorne Townend directed by Shaun Trevisick directed by Lorne Townend directed by Shaun Trevisick

executive producer, Stuart Carter ; series producer, Stephen Marsh ; executive producer for Discovery Channel, Paul Gasek ; produced by Pioneer Productions for Discovery Channel.

Overbye, Dennis, 1944-

Dennis Overbye.

Hawking, S. W. (Stephen W.)

Penrose, Roger.

Stephen Hawking and Roger Penrose.

Rees, Martin J., 1942-

DK Publishing, Inc.

Smithsonian Institution.

general editor, Martin Rees.