Many folks believe that a green sky is always a sign of an incoming tornado, but is that always true, or does it mean something else?

Viewers in Fairbanks, Alaska captured the northern lights, or the aurora borealis, on video Sunday, showing vibrant green colors rippling across the sky.

Witness the northern lights in the northern U.S. and Midwest as solar maximum activity enhances aurora visibility.

Bright green lasers shooting down from the sky in ... And the use of these lasers is a reminder of how important it is to keep our sky’s light amount down as low as possible, as these ...