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A dramatic spiral of blue light over Norway drew global media attention before being attributed to a malfunctioning Russian Bulava missile test.
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A jellyfish-like light formation appeared over the Soviet city, later linked by some analysts to a contemporaneous rocket launch.
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Brief Soviet-era scientific commission established to formally study UFO reports during glasnost-era openness.
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Massive 1908 Siberian explosion sometimes claimed by fringe theorists as an alien craft mishap; mainstream science attributes it to an airburst meteor or comet.
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Soviet state press reported children in a city park witnessing a landed craft and a giant humanoid figure; most researchers consider the account exaggerated by Soviet media.