The Hessdalen Lights

Overview

Unexplained light phenomena observed in the Hessdalen valley, Norway. Occur frequently and have been scientifically studied for decades.

Investigation

Various theories include atmospheric electricity, piezoelectricity, and combustion of hydrogen. No definitive explanation has been found despite extensive research.

Why it matters

A rare instance of long-term scientific study of an unexplained aerial phenomenon, providing valuable data but no conclusive answers.