Professor Stephen Hawking has given a lecture entitled 60 Years In A Nutshell to a gathering of eminent physicists as part of his 60th birthday celebrations.

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The event is also to be shown later in the year on the corporation's new digital channel, BBC Four, which launches in March. BBC Four will be dedicated to in-depth factual programming.

The Hawking lecture will be a major feature in BBC Four's space and other science output.

Stephen Hawking, Lucasian Professor of Mathematics at the University of Cambridge, UK, was 60 on Tuesday.