why was asteroid blast
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The Chelyabinsk meteor was a superbolide that entered Earth's atmosphere over Russia on 15 February 2013 at about 09:20 YEKT (03:20 UTC). It was caused by an approximately 20 m (66 ft) near-Earth asteroid with a speed relative to Earth of 19.16 ± 0.15 kilometres per second (60,000–69,000 km/h or 40,000–42,900 mph).
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