The Auger collaboration, which operates a cosmic ray observatory spanning 3000 km2 (~1158 sq mi) in the Argentine Andes, announces the observation of an unexpected structure in the spectrum ...

Cosmic ray air showers are produced when high-energy cosmic particles enter Earth’s atmosphere and interact with atmospheric nuclei, generating cascades of secondary particles. These extensive air ...

The "needle in the haystack" discovery of a powerful explosion from a mysterious unknown object outside our galaxy has excited astronomers. It went unnoticed for years within a vast, two decade-long ...