NASA says the blast was the second-largest meteor impact on record. - NBCNewsMACH
weighed about 1,500 tons, had a diameter of about 32 feet, and was traveling through the atmosphere at about 71,582 mph when it exploded. The blast occurred about 15.5 miles over the ocean and erupted with an energy equivalent to 173 kilotons of TNT — roughly 10 times the energy of theThe world's asteroid-monitoring groups failed to see the rock headed our way likely due to its smallish size.
The December 2018 impact only came to attention this week thanks, in part, to a presentation at the Lunar and Planetary Science Conference in Texas that was delivered by Kelly Fast, NASA's near-Earth objects observations program manager. Fast that the December event exploded with"40 percent the energy release of Chelyabinsk," but didn't show up in the news because of the impact's relatively remote location.
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