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The northern lights over Tucson
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A low-pressure system slowly moving into Southeast Arizona will bring cooler temperatures and a chance of weekend rain, the forecast shows.
The Aurora Borealis lit up the Southern Arizona sky Tuesday night, as shown here in an iPhone photo taken just southwest of Tucson. Geomagnetic storms brought the northern lights to much of the U.S. that night, painting the sky in vibrant hues of green and pink.
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