Known as the Hessdalen Phenomenon, the flashing orbs can be as large as cars and have even attracted attention from ufologists.
But now scientists think the unusual lights could be formed by a natural ‘battery’ buried deep underground, created by metallic minerals reacting with a sulphurous river running through it.
They revealed that the lights make no sound, appear to be cool and do not leave any scorch marks on the ground, unlike ball lightning. They do however sterilise an area upon contact, killing the soil microbes.
Interesting. This phenomenon has been fairly well documented and researched...