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."
Dr. Perlmutter on his Nobel Prize-Winning Discovery
                                  Dr. Perlmutter presents, “Supernovae, Dark Energy and the Accelerating Universe: How the Energy Department Helped to Win (yet another) Nobel Prize."
                              
              
                                  Video courtesy of the Department of Energy
                              
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