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並前往https://theconversation.com/an-asteroid-impact-could-wipe-out-an-entire-city-a-space-security-expert-explains-nasas-plans-to-prevent-a-potential-catastrophe-177023

An asteroid impact could wipe out an entire city - The ...

NASA has only mapped 40% of the potentially dangerous asteroids that could crash into Earth. New projects will boost that number, ...

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