Cosmic rays seen at Earth show a wide range of particle energies, from 107 electron-volts (eV) to more than 1020 eV, the ...

A new study published in Physical Review Letters by the IceCube Collaboration reports evidence that the energy spectrum of ...

The most energetic "ghost particle" neutrino ever detected may have been blasted at Earth by blazars, black hole engines that ...

Particles smaller than an atom hurtle through the universe nearly at the speed of light, blasted into space from something, somewhere, in the cosmos. A scientific collaboration of the Pierre Auger ...

Ultrahigh energy cosmic rays may be made of nuclei heavier than iron, according to a May 2026 Penn State study in Physical ...

In 1991, an experiment detected the highest-energy cosmic ray ever observed. Later dubbed the Oh-My-God particle, the cosmic ray’s energy shocked astrophysicists. Nothing in our galaxy had the power ...

Illustration of an array of ground-based detectors to characterize a cosmic ray shower. When high-energy cosmic particles strike the atmosphere, they produce a cascade of particles. By building a ...

In 1991, the University of Utah Fly's Eye experiment detected the highest-energy cosmic ray ever observed. Later dubbed the Oh-My-God particle, the cosmic ray's energy shocked astrophysicists. Nothing ...