Initial data
On a February morning in 1990, a dark gray disk hovered over the city stadium, from which a non-expanding light beam was coming towards the ground.
It seemed that the UFO was watching the schoolchildren, who were just running around the stadium. The "observation" lasted for 2 minutes, after which the flying disk extinguished the beam and disappeared, as if dissolving into the sky.
Hypotheses
Investigation
Resume
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