New data shows cosmic rays are more complex than expected

During the American Physical Society's 2015 April Meeting, to be held April 11-14 in Baltimore, Maryland, Eun Joo Ahn from Fermilab will present data from the most extensive study yet on the composition of cosmic rays--an 8-year-long project carried out at the Argentina-based Pierre Auger Observatory. Their results show that cosmic rays are more complex than previously thought: instead of being made up solely of very light particles (like protons) or very heavy ones (like iron), the data suggest...