2013年1月20日 星期日

BBC News - Home: 'Cosmic bang' hit Medieval Earth

BBC News - Home
The latest stories from the Home section of the BBC News web site.
thumbnail 'Cosmic bang' hit Medieval Earth
Jan 21st 2013, 06:00

A gamma-ray burst - the most powerful explosion known in the Universe - may have hit the Earth in the 8th Century, a study suggests.

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