Fermi e-book cover (IMAGE) NASA/Goddard Space Flight Center Caption Cover for the e-book “Our High-Energy Universe: 15 Years with the Fermi Gamma-ray Space Telescope.” Credit NASA Usage Restrictions No restrictions. License Public Domain 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.