A rare solar flare directed at Earth means 30 states could see the aurora borealis, or northern lights, as some lucky Americans see them in Minnesota.
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The Space Weather Prediction Center issued a G2 (moderate) geomagnetic storm watch into Sunday night, with a chance of a G3 (strong) developing later in the night.
The center has a five-level geomagnetic storm scale, with G1 storms registering as minor and G5s considered extreme. A G2 storm typically happens 360 days every 11 years, the center says.
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