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Page last updated at 08:15 GMT, Wednesday, 29 August 2012 09:15 UK

Supernova spotter strikes again

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An amateur astronomer in Ireland has scored a remarkable double hit after finding his second supernova - an exploding star - in two years. Irish astronomer Dave Grennan told today presenter James Naughtie how he discovered the object, which is 120 million light years away.


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