Cosmic-ray Detector (image) University of Chicago Caption One of the Auger Observatory's surface detectors. The Andes Mountains provide a snow-capped backdrop to the west of the surface detector array. Credit Pierre Auger Observatory Usage Restrictions This photo may be used by news organizations in reports describing the research of the Auger Cosmic Ray Observatory. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.