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Time-lapse of a particularly intense aurora borealis display

Photographer Göran Strand created this stunning time-lapse video made from photographs of the aurora borealis as seen from Östersund, Sweden on March 17, 2013. The video consists of 2,464 images taken over four hours. The extreme intensity of the aurora borealis display resulted from a huge solar storm spurred by two solar flares that erupted on March 6.

How big are solar flares, really?

Mmmmmmm, delicious context. When the news says "massive," this is what they mean.

Thanks to Scott Stevenson for making this and sending it my way!