Scientists have traced the most energetic particles in the universe to their source: giant black holes.
By Emily Sohn, 00:00 AM November 9, 2007
You may have a lot of energy sometimes—after eating some candy, for example. But the energy you have in your most hyper moments pales in comparison to the energy packed in ultra-high-energy cosmic rays.
Cosmic rays are particles that travel from space into Earth's atmosphere. Ultra-high-energy cosmic rays are tiny, very rare particles that contain extremely large amounts of energy. These rays have more energy than any other known particles in the universe.
This illustration shows the showe...
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