Most of the light streaming through the Universe is invisible to human eyes.
Beyond the mid-range wavelengths we can see, there's a whole cosmos shining in high- and low-energy radiation.
Fermi constantly surveils the entire sky, observing gamma-ray sources and how they change over time, providing astronomers with a map of the various producers of gamma radiation that we can detect. This data is compiled into a catalog that scientists can use to probe the production of gamma radiation.
The yellow circle, meanwhile, represents the apparent path of the Sun across the sky for that time period. Some of these quasars have jets of plasma launched from the galactic nucleus. As the black hole feeds, some of the material swirling around it is diverted and accelerated along the magnetic field lines outside the event horizon. When it reaches the poles, this material is launched into space at high speeds, often approaching the speed of light in a vacuum.
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