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Now NASA is working towards medadvice.net logging some of the smaller asteroids, those measuring 140 metres wide or more. Of the 25,000 estimated asteroids of this size, so far about 8,000 have been logged, leaving 17,000 unaccounted for. Considering that a 19-metre asteroid that exploded above the city of Chelyabinsk in Russia найти работу в тюмени in 2013 injured 1,200 people, these middle-sized asteroids would be a serious danger if they enter Earth’s orbit.