The mystery began when a blue light seemed to soar up from behind a mountain in the north of the country. It stopped mid-air, then began to move in circles. Within seconds a giant spiral had covered the entire sky. Then a green-blue beam of light shot out from its centre - lasting for ten to 12 minutes before disappearing completely.
Onlookers describing it as 'like a big fireball that went around, with a great light around it' and 'a shooting star that spun around and around'.
The Norwegian Meteorological Institute was flooded with telephone calls after the light storm.
Totto Eriksen, from Tromsø, told VG Nett: 'It spun and exploded in the sky,'
He spotted the lights as he walked his daughter Amalie to school.
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.'
Celebrity astronomer Knut Jørgen Røed Ødegaard said he had never seen anything like the lights.
He said: 'My first thought was that it was a fireball meteor, but it has lasted far too long.
'It may have been a missile in Russia, but I can not guarantee that it is the answer.'
Air traffic control in Tromsō claimed the light show lasted 'far too long to be an astronomical phenomenon'.
Norwegian defence spokesman Jon Espen Lien also said the lights were probably from a Russian missile test claiming it was normal for Russia to use the White Sea and the Barents Sea as a testing ground.
Tromsō Geophysical Observatory researcher Truls Lynne Hansen agreed, saying the missile had likely veered out of control and exploded, and the spiral was light reflecting on the leaking fuel.
But the mystery deepened last night as Russia denied it had been conducting missile tests in the area.
A Moscow news outlet quoted the Russian Navy as denying any rocket launches from the White Sea area.
Norway should be informed of such launches under international agreements, it was stressed.
The Russian Defence Ministry was unavailable for comment.
Explanation.
Onlookers describing it as 'like a big fireball that went around, with a great light around it' and 'a shooting star that spun around and around'.
The Norwegian Meteorological Institute was flooded with telephone calls after the light storm.
Totto Eriksen, from Tromsø, told VG Nett: 'It spun and exploded in the sky,'
He spotted the lights as he walked his daughter Amalie to school.
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.'
Celebrity astronomer Knut Jørgen Røed Ødegaard said he had never seen anything like the lights.
He said: 'My first thought was that it was a fireball meteor, but it has lasted far too long.
'It may have been a missile in Russia, but I can not guarantee that it is the answer.'
Air traffic control in Tromsō claimed the light show lasted 'far too long to be an astronomical phenomenon'.
Norwegian defence spokesman Jon Espen Lien also said the lights were probably from a Russian missile test claiming it was normal for Russia to use the White Sea and the Barents Sea as a testing ground.
Tromsō Geophysical Observatory researcher Truls Lynne Hansen agreed, saying the missile had likely veered out of control and exploded, and the spiral was light reflecting on the leaking fuel.
But the mystery deepened last night as Russia denied it had been conducting missile tests in the area.
A Moscow news outlet quoted the Russian Navy as denying any rocket launches from the White Sea area.
Norway should be informed of such launches under international agreements, it was stressed.
The Russian Defence Ministry was unavailable for comment.
Explanation.
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