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2012 DA14 (asteroid)
Chelyabinsk meteor: Weather satellites tracked fireball's path
Chelyabinsk meteor: Weather satellites tracked fireball's path

Cloudy with a chance of meteorites? Scientists studying the Chelyabinsk meteor that hurtled through the atmosphere over Russia in February have managed to track its trajectory using weather satellites, according to a study in Proceedings of the National Academy of Sciences. Around 9:20 a.m. local time on Feb. 15 , the approximately 56-foot-wide Chelyabinsk fireball, carrying a mass of 7,000 to 10,000 tons and traveling at about 40,000 mph, exploded in the stratosphere with an estimated energy of 100 to 500 kilotons of TNT, roughly on par with a modern nuclear bomb. That’s because, even though we think of the Earth’s atmosphere as being thin and tenuous, “an object...

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