A mysterious giant spiral of light that dominated the sky over Norway on Wednesday has stunned experts - raising the possibility of an entirely new astral phenomenon. Witnesses across Norway all described seeing a spinning "Catherine wheel-style" spiral of white light, centered around a bright moon-like star. A blue "streaming tail" appeared to anchor the spiral to earth, before the light "exploded" into a rotating ring of white fire. Norwegian defence spokesman Jon Espen Lien also said the lights were probably from a Russian missile test. But the Russian military have strongly denied any rocket launches from the White Sea area.