Where to watch tonight’s northern lights across the U.S. and Canada, and how your phone can help

A solar flare is triggering geomagnetic storms overnight, bringing the aurora borealis to dark skies across North America

You don’t need an expensive flight to Scandinavia or a luxury glass-igloo reservation in Iceland to catch the aurora borealis tonight. In fact, for millions of skywatchers across Canada and the U.S., you might only need a full tank of gas, a dark str... [2759 chars]