Fermi Data (IMAGE) NASA/Goddard Space Flight Center Caption Fermi data invalidates a once-popular explanation for the extragalactic gamma-ray background. Jets from active galaxies play only a minor role in producing the emission. Credit NASA/DOE/Fermi LAT Collaboration Usage Restrictions None License Licensed content 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.