NASA tracks thousands of near-Earth asteroids annually, most of which are harmless, but some large enough to destroy entire cities; the asteroid that killed the dinosaurs was approximately 10 km wide, and currently no known asteroid poses a threat to Earth.
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A city killing asteroid could already be heading toward Earth. NASA tracks thousands [music] of near-Earth asteroids every year. Most are harmless, but some are large enough to destroy entire cities or worse. The asteroid that killed the dinosaurs was about 10 km wide. The good news, right now no known asteroid threatens Earth.
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