A magnetar is a dead star with a magnetic field so powerful it can tear atoms apart and fry electronics from thousands of miles away—if it were that close. It's the twisted corpse of a massive star, spinning slowly, and sometimes unleashing violent bursts of X-rays and gamma rays that can outshine entire galaxies for a split second.
Luckily, the nearest one is 9,000 light-years away. For now.
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