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This is Scientific American's 60-Second Space. I'm John Matson. Got a minute?

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Since that meteor streaked through Russian skies on February 15th a lot of people have been thinking about asteroid defense.

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If an inbound space rock were discovered early enough, a spacecraft could divert it any number of ways:

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by nuking it, smashing into it or tugging it off course.

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Then there's an idea advocated by aerospace engineer David Hyland of Texas A&M University:

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just spray a coat of paint on the asteroid and let the sun do the rest.

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The proposal relies on the so-called Yarkovsky effect.

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The hottest part of an asteroid--where it's afternoon, asteroid local time--radiates the most heat into space,

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and those thermal photons impart a gentle recoil force.

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It's incredibly subtle, but it's constant,

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so the Yarkovsky effect can significantly change an asteroid's orbit over time.

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A new study in the journal Icarus identifies more than 20 asteroids that have been noticeably shifted by the Yarkovsky effect, naturally.

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Paint would enhance or reduce the effect by changing an inbound asteroid's reflectance, thereby steering it away from us.

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Currently no asteroids that we know of present a real threat to Earth.

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But it's good to be prepared.

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Ask the dinosaurs.

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Thanks for the minute, for Scientific American's 60-Second Space. I'm John Matson.

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