In this combination of photos made from frame grabs from dashboard camera video, a meteor streaks through the sky over Chelyabinsk, about 1500 km east of Moscow, on February 15, 2013. Photo: AP

Are asteroids humanity’s ‘greatest challenge’? Maybe, and we have nothing to protect us against them

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In this combination of photos made from frame grabs from dashboard camera video, a meteor streaks through the sky over Chelyabinsk, about 1500 km east of Moscow, on February 15, 2013. Photo: AP
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