The Northern Lights are a classic in the Scandinavian countries, but they are not the only phenomenon in this area. There are other lights in this area.

The Hessdalen lights are located in the valley that bears his name are very variable, as they sometimes fly quickly through the air, during a few secondsand others remain stable during an hour. They do not always take the same direction, their movement is usually random.

What never varies is size, this corresponds to that of a car. According to the IFLScience report, residents have been appreciating these lights since 1930. The valley in which the Hessdalen lights form has several mines, some in operation and others already closed.

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Computer scientist Erling Strand, a small team from the University of Oslo, the University of Bergen and the Norwegian Defense Research Establishment have attempted to document and explain the lights. What causes them? Unfortunately, it is not known for certain, but there are several theories.

One theory, advanced in a 2010 paper published in the Journal of Atmospheric and Solar-Terrestrial Physics, suggests that the phenomenon is caused by radon decaying in the atmosphere, as the Hessdalen Valley has one of the highest concentrations of radon in the world. Europe has.

What is Radon? This is a chemical element, responsible for much of the natural background radiation to which humanity is constantly exposed. However, radon levels vary from region to region.

Norway has one of the highest radon concentrations highest in Europe. Moreover, this is especially high in the valley in which the Hessdale lights.