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The universe is big

Nobel laureate Brian Schmidt takes us on a 15-minute tour of the Universe, explaining the thinking that led him and his colleagues to identify a hitherto unknown force: 'dark energy' that, incredibly, makes up some 70% of the Universe. TEDxSydney 2012 took place on Saturday 26 May 2012 at Carriageworks. Tens of thousands of people enjoyed the day: 800 in the theatre, over 1,000 via big screen simulcast in The Forum, many thousands online via YouTube and ABC Big Ideas ... and up to 80,000 tuning in to ABC Radio National.