Witnessing the Aurora Borealis can feel like you’re glimpsing another world. For some people, that’s exactly what’s happening. Photographer Hugo Sanchez captured his first images of the spectacle accidentally, when he was taking shots of a meteor shower. But soon he became hooked, and then, when his young son died, the dancing lights took on a whole new meaning. In this replay of one our favorite episodes from our archives, we hear the story of a man who found a sense of purpose in the wintertime sky.