Scientists have just detected the second most powerful cosmic ray but explaining its origin might require some new physics. It had an estimated energy of 240 exa-electron volts, making it comparable to the most powerful cosmic ray ever detected, the Oh-My-God particle, which was discovered in 1991.

Scientists have just detected the second most powerful cosmic ray but explaining its origin might require some new physics. It had an estimated energy of 240 exa-electron volts, making it comparable to the most powerful cosmic ray ever detected, the Oh-My-God particle, which was discovered in 1991.