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Hawking turns 70 with talk on space and time

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CAMBRIDGE, ENGLAND (AP) - Renowned physicist Stephen Hawking is celebrating his 70th birthday in typically ambitious fashion _ with a wide-ranging discussion of the nature of the universe.

The celebrity scientist is at the center of a daylong conference on cosmology being hosted at England's Cambridge University.

An expert on black holes, Hawking gained wide acclaim for popularizing the work of theoretical astrophysicists in best-selling books such as "A Brief History of Time" and "The Universe in a Nutshell."

Other speakers Sunday include Astronomer Royal Martin Rees, Nobel Prize-winning physicist Saul Perlmutter, and Hawking's longtime collaborator Kip Thorne. Among the topics due to be discussed are supernovae, black holes, and dark matter.

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Online:

http://www.ctc.cam.ac.uk/hawking70/

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