The lights seen in this valley in central Norway were first noticed in 1981. The appearances seemed to start suddenly with the unexplained lights winking on throughout the valley near people's homes and beneath the ridges of the surrounding mountains. Most of the lights were described as spheres, although some witnesses also reported cone shapes. Various colors were attributed to them, but the predominant hues were white or yellow-white. Blue flashes of light appearing in groups of three and forming a triangle were also seen. Østfold College has undertaken a study of the phenomenon.
More information: Project Hessdalen
