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WATCH LIVE: Asteroid 2012 DA14 as it passes Earth
This afternoon, the 50-meter-wide space rock will be a mere 17,000 miles from our planet
Geoengineers in Scotland want to exploit a well-positioned asteroid to generate a dust cloud that would help block the sun's harmful rays from Earth.
Geoengineers in Scotland want to exploit a well-positioned asteroid to generate a dust cloud that would help block the sun's harmful rays from Earth.
Thinkstock/Hemera

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