Stunned onlookers flooded the Norwegian Meteorological Institute with calls after seeing the dazzling light.
Witness Totto Eriksen from Tromsø spotted the lights on the school run with his daughter Amalie.
He said: "We saw it from the Inner Harbor in Tromsø. It was absolutely fantastic.
"It almost looked like a rocket that spun around and around and then went diagonally down the heavens."
"It looked like the moon was coming over the mountain, but then came something completely different."
Nick Pope, former UFO analyst for the Ministry of Defence, said: "My first thought was this was a meteor, a fireball, or debris from an old satellite burning up in the Earth's atmosphere.
"But the spiral motion makes this unlikely. This is truly bizarre. It's a real mystery.
"A meteor or a fireball would simply travel in a straight line but for something to spiral in this way appears to go against the laws of physics.
"Some halfwits may think it is the Northern Lights but they illuminate the sky with a green glow. This is completely different from any image of the Northern Lights that I have ever seen.
"It's ironic that something like this should happen the very week after the MoD terminated its UFO project. It just goes to show how wrong that decision was."
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