Earth faces a significant threat from thousands of undetected asteroids capable of destroying cities. NASA's planetary defence chief warns that current systems cannot reliably stop these 'city-killers'. While progress is being made with new telescopes and international efforts, a substantial gap remains in our ability to detect and deflect such objects before they impact our planet.from Science News: Fresh Discoveries, Research & Breakthroughs https://ift.tt/cEvBfma
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