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NASA Fermi Telescope Detects Gamma Rays That Confirm Magnetars Power the Universe's Brightest Stellar Explosions

After a two-decade search, the NASA Fermi Gamma-ray Space Telescope has found direct gamma-ray evidence that rapidly spinning magnetars drive superluminous supernovae, the brightest stellar explosions ever recorded. The signal came from SN 2017egm in NGC 3191, a galaxy about 440 million light-years away in Ursa Major. Researchers at Louisiana State University report a 4.7-sigma detection above background after correcting for trials, confirming the Kasen-Bildsten magnetar engine model first proposed in 2010. The finding resolves a long-standing debate about what energy source can outshine an entire galaxy for weeks at a time.