Fermi's Large Area Telescope (IMAGE) NASA/Goddard Space Flight Center Caption The Large Area Telescope (LAT) on Fermi detects gamma-rays by tracking the electrons positrons they produce after striking layers of tungsten. This ability also makes the LAT an excellent tool for exploring high-energy cosmic rays. Credit NASA/Goddard Space Flight Center Conceptual Image Lab Usage Restrictions NOTE: There is also an Associated video for the LAT, on the web page provided for this release. 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.