Back in the early 1970s we thought that experiments like the SUGAR array were on the verge of establishing the origin of the highest energy cosmic rays. Little did we know!
However, over the last 12 years the Pierre Auger Observatory has been accumulating data using a much bigger collecting area than SUGAR and have recently announced that there is a preferred direction, corresponding to the greatest concentration of galaxies in the night sky.
More information here
A few years ago they made then retracted a similar claim so let's see if it stands up.
- Laurie
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