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if it hits Earth, its destructive power will be much higher than what scientists originally expected. Based on previous data, NASA estimated an impact of 510 megatons for Apophis. That's more than two times the energy released by the Krakatoa eruption of 1883, an event that changed Earth's global climate for five years.
http://gizmodo.com/5974708/apophis-may-destroy-earth-satelli...
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