NASA estimeaza ca aproximativ 4.700 de asteroizi se afla indeajuns de aproape de Pamant si sunt suficient de mari pentru a reprezenta un pericol la adresa oamenilor.
Informatiile NASA provin de la telescopul spatial WISE, lansat in decembrie 2009. Conform agentiei americane, cei 4.700 de asteroizi au un diametru mai mare de 100 de metri, avand o traiectorie de deplasare la mai putin de opt milioane de kilometri de orbita Terrei.
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