HISTORICAL

Petrozavodsk phenomenon — A glowing jellyfish-shaped object hovered over the city of Petrozavodsk for ten minutes, ejecting rays of light. Later analyzed as plasma effects from the Kosmos-955 rocket launch but witnessed across northern Europe.

In the early morning of September 20, 1977, residents of Petrozavodsk in northwestern Russia witnessed an enormous luminous object that hovered over the city and ejected rays of light toward the ground, leaving small holes in windows and concrete. The sighting was widely reported across Finland and Scandinavia and became one of the most prominent Soviet-era UFO cases. 【Background】 Petrozavodsk, the capital of Soviet Karelia, sits on the western shore of Lake Onega about 250 km from the Finnish border. At roughly 4 a.m., thousands of residents — including factory workers heading to early shifts — observed a jellyfish-like luminous object in the eastern sky. Concurrent reports came in from Helsinki, Vyborg, and Leningrad. 【The Encounter】 Witnesses described an object that radiated a bright halo and dispersed thin beams of light that fell vertically over the city for roughly ten minutes. Several reports mentioned a hole appearing in the upper-floor glass of a residential building, and unexplained openings in pavement. The "rain of light" was visible across hundreds of kilometres. 【Investigation】 Soviet officials initially attributed the phenomenon to an unscheduled rocket launch from the Plesetsk Cosmodrome — specifically the Kosmos 955 launch. However, the timing, geometry, and reported physical effects on windows did not fully fit a standard rocket plume. The Soviet Academy of Sciences opened the "Setka" / "Galaktika" programme to investigate unidentified phenomena partly in response to public reaction to the case. 【Modern Assessment】 Most modern researchers consider Petrozavodsk to be the rocket launch viewed through unusual atmospheric conditions, with the fuel plume forming the characteristic jellyfish shape. However, reports of physical damage to glass and concrete remain unexplained by the rocket hypothesis alone. The case is historically significant as it pushed Soviet authorities to formalise UFO study at the Academy of Sciences level, ending decades of public denial. Source: https://en.wikipedia.org/wiki/Petrozavodsk_phenomenon

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Source: Wikipedia