Hessdalen light

The Hessdalen lights are unexplained nocturnal lights observed in 7.5-mile-long (12 km) Hessdalen valley in rural central Norway.

The Hessdalen lights are of unknown origin. They appear at night, and seem to float through and above the valley. They are usually bright white, yellow, or red and can appear above and below the horizon. Duration of the phenomenon may be a few seconds to well over an hour. Sometimes the lights move with enormous speed; at other times they seem to sway slowly back and forth. On yet other occasions, they hover in mid‑air. Some hypothesise that the light is ionised iron dust.

Unusual lights have been reported in the region since at least the 1930s. Especially high activity occurred between December 1981 and mid-1984, in which period the lights were being observed 15–20 times per week, attracting many overnight tourists who arrived in for a sighting. As of 2010^[update], the number of observations has dwindled, with only 10 to 20 sightings made yearly.

Since 1983, there has been ongoing scientific research, referred to as "Project Hessdalen", initiated by UFO-Norge and UFO-Sweden. This project was active as field investigations during 1983–1985. A group of students, engineers and journalists collaborated as "The Triangle Project" in 1997–1998 and recorded the lights in a pyramid shape that bounced up and down. In 1998, the Hessdalen Automatic Measurement Station (Hessdalen AMS) was set up in the valley to register and record the appearance of lights.

Later, the EMBLA programme was initiated to bring together established scientists and students into researching these lights. Leading research institutions are Østfold University College (Norway) and the Italian National Research Council.

Despite the ongoing research, there is no convincing explanation for the phenomenon. However, there are numerous working hypotheses and even more speculations.

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