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This is Scientific American 60-Second Space, I'm Clara Moskowitz.Got a minute?

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Right this moment, a massive ball of ice and dust is careening toward the sun.

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Comet ISON has flared so bright in recent days that it's now visible with the naked eye.

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And the comet will likely keep getting brighter until November 28th,

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when it dives closest to the sun, coming within just three solar radii of the sun's surface.

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If ISON survives this Thanksgiving Day encounter, it could make for some truly spectacular sky-watching.

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There's a small chance it could even be faintly visible in daylight.

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But such views would be dashed if the comet's ice core disintegrates from the sun's intense rays and gravitational force.

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The rare comet was discovered last September.

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ISON started its journey thousands of years ago in the Oort Cloud,

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a spherical collection of icy bodies about one light-year from the sun.

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The comet now appears as a faint smudge in the eastern sky before dawn.

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Its tail has noticeably lengthened, and is now almost as wide across the sky as the bowl of the Big Dipper.

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So grab a telescope or binoculars, or just look up: don't miss this once-in-many-lifetimes event.

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Thanks for the minute, for Scientific American 60-Second Space. I'm Clara Moskowitz.

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