31_Hessdalen_Slide_edit.jpg

Flickr/Morten Oddvik/CC BY-NC 2.0

Speculation about the mysterious flashes of light have made the tiny village famous. Some people believe the lights are caused by extraterrestrial activity, according to Visit Norway. One scientist thinks bubbles of ionized gas are made when sulphurous fumes from the River Hesja react with humid air, forming the balls of light.