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Asteroids And Meteoroids

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How to defend against asteroids and meteors

Typically the preserve of science-fiction, now top of the news agenda, the prospect of an asteroid striking earth is raising alarm. This morning a meteor streaked across the sky in Russia, causing explosions and injuring 400 people. Later today a 150-ft asteroid will shave past earth at 17,000 miles distance, the closest recorded. If it hit, it could flatten London. So what defences do we have?