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On August 21, 2017, the Earth will cross

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the shadow of the Moon, creating a total solar eclipse.

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Eclipses happen about every 6 months, but this one is special.

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For the first time in almost 40 years,

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the path of the Moon's shadow passes through the continental United States.

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Everyone there will see the Moon at least partially the sun.

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People within the path of totality, shown here

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in red, will witness a total solar eclipse.

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For them, the Moon will cover the sun entirely.

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The sky will become twilight, the air will cool, the stars will appear,

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and the black disk of the Moon will be surrounded

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by the pale, streaming halo of the sun's corona.

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Totality will last for 2 minutes or a little more, and it be

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visible along a swath that crosses the continent from Oregon to South Carolina.

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For some, it will be the spectacle of a lifetime.

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