The article says these new findings herald "the beginning of cosmic ray astronomy"."The finding, from a telescope array 10 times the size of Paris, solves a long-standing mystery about the origins of the most energetic cosmic rays that strike the Earth's atmosphere....
[T]he origins of the highest-energy particles, which travel within a whisker of the speed of light, have been puzzling. A single proton can have as much energy as a tennis ball served at 100 kilometres per hour.
Astronomers found it difficult to explain how particles are accelerated to such enormous speeds.
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