Clue to cosmic rays discovered

[Rick]

Black holes are the most likely source of the mysterious ultra high-energy cosmic rays that bombard the planet, scientists have discovered.

Observations at the world's largest cosmic ray detector suggest the particles are emitted by huge black holes in the middle of nearby galaxies.

The findings, unveiled in Science, may solve a long-running puzzle.

More: http://news.bbc.co.uk/2/hi/science/nature/7085442.stm

[Rick]

You've always suspected it, and now some properly clever boffins think they've found the data to prove it. Yes, a rare breed of supermassive black hole, otherwise known as active galactic nuclei, are the most likely source of the super-charged cosmic rays that batter our tiny planet from time to time.

More: http://www.theregister.co.uk/2007/11/09/agn_blamed_for_cosmic_rays/