E-Mail IMAGE: An infrared image of the dust clouds in the Cocoon region taken with the Spitzers Space Telescope's IR photometer. The HAWC TeV gamma-ray excess (color from green to yellow to... view more Credit: TeV: Binita Hona (HAWC Collaboration), IR: Hora et. al, Spitzer's Growing Legacy, ASP Conference Series, 2010, P. Ogle, ed. LOS ALAMOS, N.M., March 11, 2021--A long-time question in astrophysics appears to finally be answered, thanks to a collection of large, high-tech water tanks on a mountainside in Mexico. The High-Altitude Water Cherenkov (HAWC) data shows that the highest-energy cosmic rays come not from supernovae, but from star clusters.