NASA | Fermi Traces a Celestial Spirogra...

NASA | Fermi Traces a Celestial Spirograph NASA's Fermi Gamma-ray Space Telescope orbits our planet every 95 minutes, building up increasingly deeper views of the universe with every circuit. Its wide-eyed Large Area Telescope (LAT) sweeps across the entire sky every three hours, capturing the highest-energy form of light - gamma rays - from sources across the universe.

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