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Gamma ray bursts as source of highest energy particles “all but ruled out”?

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In “’Extreme Universe’ puzzle deepens” (BBC News, April 19, 2012), Jason Palmer reports,

The mystery surrounding the source of the highest-energy particles known in the Universe has grown deeper.

The particles, known as cosmic rays, can show up with energies a million times higher than the biggest particle accelerators on Earth can produce.

Astrophysicists believed that only two sources could make them: supermassive black holes in active galaxies, or so-called gamma ray bursts.

A study in Nature has now all but ruled out gamma ray bursts as the cause.

More. Guess it’s down to black holes now.

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