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The Hessdalen lights are a mysterious phenomenon which has been reported in the valley of the same name, in Norway, since 1811. However, it was in the 1980s when they began to be taken more into account, especially in 1984, when the Hessdalen project was established, aimed at monitoring them and trying to explain them. Unfortunately, despite all the efforts that have been put into this, it is currently not known exactly what this is due to. Although it is true that there are some hypotheses. A very disparate phenomenon. Both witnesses who have seen them and scientists who have recorded or photographed them describe the Hessdalen lights as a very disparate phenomenon. Sometimes they are formed at ground level, other times on roofs or at the height of mountain peaks. Sometimes they move more or less homogeneously, other times they move erratically, changing direction for no apparent reason. They are normally white and yellow, although they have been observed in other colors. Some last only a few seconds, while some can remain in the air for more than an hour. Even the shapes vary from an American football to an upside-down Christmas tree. The only thing that most witnesses seem to agree on is that they are about the size of a car. Hessdalen Project. A multidisciplinary team of scientists from several Norwegian institutions launched a project aimed at monitoring the lights of Hessdalen. Since then, they have been monitored thanks to the installation of radioelectric spectrum analyzers, magnetometers, seismographs, photo cameras, Geiger counters and infrared cameras. That is, earth tremors, magnetism, radioactivity and, ultimately, the emission of energy at different lengths of the electromagnetic spectrum are analyzed. This tracking system began operating in 1984 and is still active today. A peculiar hypothesis. One of the most peculiar hypotheses that have been made about the Hessdalen lights is that they could be the visible result of the formation of a wormhole micrometer that connects two points in space time. In reality, this hypothesis was raised in a magazine with little scientific reputation, very given to conspiracy theory and the supernatural, so it is not the most accepted at all. Hypotheses in the air. Thanks to the monitoring of these lights, there are much more plausible hypotheses. To begin with, it is thought that the Hessdalen lights could be due to the decay of radon, a very abundant gas in the Norwegian atmosphere. This disintegration would produce alpha particles capable of ionizing the molecules present in the air and dust, giving rise to structures capable of emitting light, called Coulomb crystals. Hypotheses on the ground. There are also hypotheses that point to the geology of the valley. For example, it is believed that it could be due to the combustion in the presence of air of dust clouds rich in scandium, an element that is abundant in the soil of this Norwegian region. It could also be a piezoelectric effect. This is the effect by which some materials are capable of emitting electricity when pressed or deformed. Quartz, for example, has great piezoelectricity and turns out to be very abundant under the valley floor. Copper is also abundant, which is a great conductor of electricity. And speaking of electricity, a battery effect could also be occurring. On one side of the river in the valley there are rocks very rich in zinc and iron. On the other side, rocks very rich in copper. The former could act as the anode of a battery and the latter as the cathode. In turn, local mines rich in sulfur could be releasing this element into the river, which would act as the bridge of a battery, allowing electricity to flow. If there is electricity, there is light. All these electricity emissions could be causing the ionization of molecules present in the air, giving rise to a process in which light is emitted. It is something similar to what happens with the northern lights, although the origin of the ionizing particles is totally different. The color of light depends on the molecules in the air. That is why it is not always exactly the same, although white and yellow tend to be abundant. In short, it is still not known where these mysterious lights come from, which can be seen both day and night. But that is precisely why they are so fascinating. Image | Bjørn Gitle HaugeØstfold University College, Fredrikstad, Norway In Xataka | Norway works little but produces a lot and that stresses them out. Generation Z has found the solution: the four-day week