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Fermi Gamma-ray Space Telescope | United States satellite | Britannica
Gamma-ray astronomy - Wikipedia
Fermi Gamma-ray Space Telescope discovers the most extreme blazars yet
The Cherenkov Telescope Array – unveiling the deepest secrets of the gamma-ray Universe | ESCAPE
Highest-energy gamma rays: ground based telescopes, sources
NASA's Fermi Gamma-Ray Space Telescope discovers High Energy Neutrino coming from Supermassive Black Hole - Clarksville Online - Clarksville News, Sports, Events and Information
This is Selden's model of the Gas-Cherenkov Gamma-Ray Telescope for Celestia