"On 10 December, the Russian Ministry of Defence confirmed that a Bulava missile test had failed. According to a spokesman, "The missile's first two stages worked as normal, but there was a technical malfunction at the next, third, stage of the trajectory." Russian defence analyst Pavel Felgenhauer stated to AFP that "such lights and clouds appear from time to time when a missile fails in the upper layers of the atmosphere and have been reported before ... At least this failed test made some nice fireworks for the Norwegians." Prior to the Russian statement, Jonathan McDowell, an astrophysicist at the Harvard–Smithsonian Center for Astrophysics, had already suggested that the unusual light display occurred when the missile's third stage nozzle was damaged, causing the exhaust to come out sideways and sending the missile into a spin."
http://en.wikipedia.org/wiki/2009_Norwegian_spiral_anomaly#Official_Russian_explanation
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