Petrozavodsk phenomenon

20 September 1977 · Petrozavodsk, Karelia, USSR · Mass sighting
DISPUTED
Explanation proposed but contested
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In the early hours, residents of Petrozavodsk saw a glowing object spread over the city like a jellyfish, "raining" shafts of light. Reports came from across the Soviet Union and Finland. The event prompted the Soviet research programme Setka.

Explanation

Usually attributed to the launch of Kosmos-955 from Plesetsk, but the 1977 Academy of Sciences report said the phenomenon could not be satisfactorily understood.

What was seen

Shape: Glowing "jellyfish" showering rays
Witnesses: Thousands, from Helsinki to Vladivostok
Duration: ~12 minutes over Petrozavodsk

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