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Personal genome; Solar cells and music; Asteroids; Alfred Russel Wallace

BBC Inside Science

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Chelyabinsk's Airbursts

There was almost half a megaton of TNT equivalent released energy in Chelyabinsk. We only expect to see something like that hit based on the number of telescopic asteroids we know are out there, about every 120 to 140 years. For an object this size, it's so close to an urban area, really, it's the sort of thing you'd only expect on time skills of every few thousand years. The models that would have been used before to calculate how much energy such an event might release were based on nuclear explosions.

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