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Petrozavodsk Close Encounter Wave

The Petrozavodsk close encounter wave is one of the most famous Cold War-era anomalous sky events in Soviet history, combining mass eyewitness reports, the famous jellyfish-like light over Petrozavodsk, wider Nordic sightings, Academy of Sciences interest, and an enduring debate over whether the phenomenon was caused by the Kosmos-955 launch or something stranger.