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This is Scientific American 60-Second Earth. I'm David Biello. Your minute begins now.

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It's hard to miss an asteroid the size of a truck exploding with all the force of a nuclear bomb.

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Such a space rock boiled across the sky near Chelyabinsk in southern Russia on February 15.

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Space objects are a constant threat to Earth.

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In the worst case, the dust cloud from a major impact could shut down photosynthesis.

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No matter how much carbon dioxide humanity spews into the atmosphere,

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we may be powerless to prevent a kind of nuclear winter from the impact of an even bigger object, like 2012 DA14 which just passed within 17,200 miles of Earth.

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That's closer than some of our Earth-observing satellites.

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Big impacts have been trouble for life on Earth since the beginning,

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perhaps holding back life's first outbreak and pressing the reset button again and again throughout the planet's history.

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Just as it makes sense to take out an insurance policy against climate change,

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it makes sense to take out an insurance policy against spaceborne threats by spending a little bit more on the kinds of satellites and telescopes that can spot them.

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Of course, the U.S.has been spending less on such observations in recent years.

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Our inability to adequately see ahead may yet prove our undoing,

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whether at our own hands or via the kind of massive meteorite that killed the dinosaurs.

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Your minute is up, for Scientific American 60-Second Earth. I'm David Biello.

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