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Winter travelers trek thousands of miles to the frozen north each year seeking the sky's "dancing lights," which provoke awe, excitement and, some say, sex.

Scientists call the natural phenomenon aurora borealis: cascading beams of greens, yellows, blues, purples or reds -- which paint a breathtaking backdrop across the wilderness and attract thousands of tourists annually.

"Usually it starts slowly as kind of a hazy greenish color -- like a mist -- building up in frequency dancing across the sky ... and to me that's religion," said photographer Dave Brosha of Yellowknife, Northwest Territories, who's seen more than 100 Canadian auroras. "It's just one of the most incredible feelings a person can have -- sitting there watching that." Read full article »

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