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Scientists at the University of Colorado and the California Institute of Technology claim that giant rock collisions pose no real threat to Earth for at least 1,000 years.
Head of the Laboratory of Meteoritics and Cosmochemistry, Institute of Geochemistry and Analytical Chemistry. V. I. Vernadsky RAS Dmitry Badyukov also reported that the Chelyabinsk fireball flew in space for about 1.2 million years before falling to Earth