has spent seven years trying to prevent Bennu — an asteroid taller than the Empire State Building and named after ancient 's fiery bird-god — from crashing cataclysmically into Earth.While Bennu's chances of impact are just 1-in-2,700, more than five times a person's chance of being , NASA's team nevertheless has categorized it as one of the two 'most hazardous known asteroids.'In a worst-case scenario, the roughly 510-meter wide, carbon-based behemoth would smash into Earth with 1,200 megatons of energy: 24 times the power of the largest ever detonated (the Soviet Union's '').
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