A number of the brightest lights within the universe shine from a few of its darkest corners — so-called supermassive black holes. Invisible to the human eye, these high-energy powerhouses mild up the cosmos with emissions which can be detected by area telescopes. 1000’s of such mild sources have been found with NASA’s Fermi Gamma-ray House Telescope, which has been observing since 2008. These aren’t simply stars — they’re lively galactic nuclei (AGN) the place massive gravitational forces fling matter round black holes, creating intense radiation blasts all throughout the electromagnetic spectrum.
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