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Northern lights could be visible over parts of the U.S. But will they make it to Philly?

"It's very angry," a space-weather expert says of the sun. But it probably isn't angry enough to send the northern lights as far south as Philadelphia. Our chance might come later.

The northern lights, or aurora borealis, illuminate the night sky above fishermen on the ice of Finnish Gulf outside St. Petersburg, Russia in January.
The northern lights, or aurora borealis, illuminate the night sky above fishermen on the ice of Finnish Gulf outside St. Petersburg, Russia in January.Read moreIVAN PETROV / AP
    by Anthony R. Wood
    Updated 
    Published