The main scientific instrument on the Fermi Gamma-ray Space Telescope (formerly Gamma-ray Large Area Space Telescope (GLAST)) is the Large Area Telescope (LAT). The Education and Public Outreach group at Sonoma State University has developed this interactive computer-based educational activity to allow students in grades 11-14 and informal 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 FGST and the LAT is also provided on the website, which is part of the Virtual Visitor Center site for the Stanford Linear Accelerator Center.

This is part of a collection of resources provided by the Space Science Education Resource Directory, and has passed a SSERD Panel Review.