What do you think caused the blue spiral that appeared in the skies of Norway yesterday morning?

Yesterday morning, December 9, 2009, around 8:00 local time a blue spiral was seen in the skies over Norway. There doesn’t seem to be any dispute that this was actually witnessed, but nobody seems to know what it was.

Here’s a video link to Brian Williams discussing the blue spiral on Nightly News

Article in the Daily Mail about the blue spiral with images and video.

What are your thoughts on this phenomenon?

Russian missile test?
Comet?
Aliens on their way to Oslo?
Worm Hole caused by LHC?

What does the collective think about this, if anything?