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The main scientific instrument on the Gamma-ray Large Area Space Telescope (GLAST) is the Large Area Telescope (LAT). This interactive computer-based educational activity allows students and web users to see the results when gamma-ray photons of different energies and incident angles hit the LAT. The photons convert into electron-positron pairs which travel through 19 interleaved layers of silicon into the cesium-iodide calorimeter. Background information about the mission and the LAT is also provided. Note: In 2008, GLAST was renamed Fermi, for the physicist Enrico Fermi.