The phenomenon began when what appeared to be a blue light seemed to soar up from behind a mountain. It stopped mid-air, then began to circulate.
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 twelve minutes before disappearing completely.
Russia denied any missile tests in the area. Link to story. Link to photo gallery. -via Metafilter
(image credit: Svein-Egil Haugen)
Because it failed. Failed rockets arent great military PR.
If not a hoax, photoshop, conspiracy, or further proof of global warming. Did I cover them all? Oh, and North Korea.
http://translate.google.com/translate?js=y&prev=_t&hl=en&ie=UTF-8&layout=1&eotf=1&u=http://www.nrk.no/nyheter/distrikt/troms_og_finnmark/1.6904061&sl=no&tl=en