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Lawrence Berkeley National Laboratory senior scientist Dr. Saul Perlmutter -- along with Brian Schmidt and Adam Riess -- won the 2011 Nobel Prize for discovering that the universe is expanding at an accelerating rate.

Below, with a special introduction by Secretary Steven Chu, Dr. Perlmutter presents, “Supernovae, Dark Energy and the Accelerating Universe: How the Energy Department Helped to Win (yet another) Nobel Prize."

Supernovae, Dark Energy, and the Accelerating Universe (Discussion with Dr. Saul Permutter)
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