Most distant cosmic blast sighted

Astronomers have witnessed the most distant cosmic explosion on record: a gamma-ray burst that has come from the edge of the visible Universe. Gamma-ray bursts are intense flares of high-energy radiation that appear without warning from across the cosmos. They can release as much energy in a few minutes as our Sun will emit in its expected 10-billion-year lifetime.

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http://news.bbc.co.uk/2/hi/science/nature/4237800.stm