To The Extreme… NASA’s Fermi Gamma-Ray Telescope Gathers In High Energy

To The Extreme… NASA’s Fermi Gamma-Ray Telescope Gathers In High Energy: It scans the entire visible sky every three hours. Its job is to gather light – but not just any light. What’s visible to our eyes averages about 2 and 3 electron volts, but NASA’s Fermi Gamma-Ray Space Telescope is