Northern lights were visible in several parts of the U.S. Tuesday night into Wednesday. So what are auroras, and what caused ...

The northern lights were visible Tuesday night across the Chicago area, illuminating the sky with brightly colorful displays ...

The northern lights could be visible Tuesday and Wednesday night in the Chicago area, due to severe solar storms.

A geomagnetic storm lit up the skies as far south as Florida late Tuesday – and some in the D.C. area were treated to red, ...