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It was just another normal day for the residents of the Russian town of Chelyabinsk as they set off for work on Friday 15 February 2013. A rock less than 20 metres wide changed all that. A meteor weighing some 11 000 tonnes hit the Earth's atmosphere above the Ural Mountains with an estimated speed of 18 km/s (65 000 km/h). It exploded over Chelyabinsk with the force of 30 Hiroshima bombs, causing a shockwave to tear through the region and injuring over 1500 people. It was the biggest meteor strike in the last 100 years, and undoubtedly the most archived ever.