VERITAS Telescope Array (image) Washington University in St. Louis Caption Physicists cannot directly see where cosmic rays come from, so they search instead for objects that produce gamma rays with energies similar to those of cosmic rays. The four VERITAS telescopes at Mt. Hopkins in Arizona (above) look for the fleeting signatures of gamma-ray collisions with Earth's atmosphere overhead. Credit K. Gibbs Usage Restrictions None 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.