The Petrozavodsk Phenomenon (1977)
On September 20, 1977, around 4 a.m., residents of Petrozavodsk, USSR, saw a giant jellyfish-shaped light hovering motionless in the sky, projecting a multitude of thin beams toward the ground. The phenomenon was reported across a vast territory, from Copenhagen and Helsinki to Vladivostok. On the ground, the beams reportedly punched tiny holes through windows and asphalt.
Witnesses
Tens of thousands, several countries
Why it endures
A simultaneous sighting across thousands of kilometers, with physical material damage measured on the ground — rare for a celestial phenomenon.
Official version (contested)
Official explanation: the vapor trail of a spy satellite launch from the Plesetsk Cosmodrome, which occurred at the exact time of the sighting.