Ask scientists about the aurora borealis and they’ll explain that the spectacular display of lights we see in the wintertime sky is caused by solar winds that send charged particles into the earth’s upper atmosphere, where they smash into gases. But witness this otherworldly show yourself, and ancient beliefs about magic often feel more true. It was the magic that mattered to Hugo Sanchez, a self-taught photographer who fled civil-war-torn El Salvador and moved to Canada. But tragedy followed him, and it was chasing the perfect shot of the northern lights that gave him a new sense of purpose.