Unlike the United States government, the French government (and many other governments) actually take UFOs quite seriously. And why wouldn’t they? You would think that inexplicable phenomenon, solid or otherwise, randomly appearing in oft-traveled airspace by both civilian and government aircraft – sometimes actually interacting with said aircraft – would be something worth investigating. Oddly, the U.S. government and scientific community both shrug their shoulders at this potentially catastrophic phenomenon. Certainly this would not be the case if strange objects were suddenly appearing without warning on major interstate highways. But I’m getting a bit off topic here.
The Hessdalen Lights are “an unexplained light usually seen in the Hessdalen valley in the municipality of Holtålen in Sør-Trøndelag county, Norway” (Wikipedia.) Below is a short but interesting slide presentation by Erling Strand of Ostfold University summing up 30 years of research on the phenomenon. It can be found on the CNES GEIPAN website. CNES is the French Space Agency (their version of NASA) and GEIPAN is the unit within CNES dedicated to investigation Unidentified Aerial Phenomenon (UAP / UFO) and reporting their findings to the public.