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Now, two comets are expected to put on a naked-eye spectacle for sky watchers in the Northern Hemisphere.
CNN: Welcome to the year of the comet (we hope)
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Traditional reliance on naked-eye observations has always been the way.
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About 4, 000 boat owners are to be given the liquid - which is invisible to the naked eye - to paint their property.
BBC: Boat owners in Hampshire given anti-theft paint
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It already has a 64, 000km-long tail of dust and gas that will become visible to the naked eye later in the year - a trail scientists will study closely.
BBC: Comet Ison caught on film by Deep Impact craft
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What sellers soon realized was that the SEC was turning a blind eye to naked short-selling, thus adding even more pressures to beleaguered bank equities.
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The samples revealed "no-see-um" gold, invisible to the naked eye but detectable via assay.
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While a total eclipse is safe enough for the naked eye, gazing directly at a partial eclipse -- even one in which 99% of the sun is covered -- is a definite no-no.
CNN: HE GODS WERE DRINKING
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"You could see the snipers moving up with a naked eye, " says Debra Banks, a 55-year-old from Sacramento, Calif.
WSJ: Western Tourists Caught in Tajik Drama
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In 2029, it will approach the Earth within a distance closer than a geostationary satellite - and near enough to be seen with the naked eye.
BBC: Foresight mission spacecraft Image
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It is a quiet, tacit, mandatory add-on for all FHA mortgage consumers, measured in basis points and virtually invisible to the naked eye.
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