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This section contains descriptions of unexplained facts provided by eyewitnesses or published in the media, as well as the results of their analysis by the group.

UFO. Bulgaria

ID	#1594199159
Added	Wed, 08/07/2020
Author	July N.
Sources	thinkaboutitdocs.com U.F.O. Investigator, 5 Vol. IV, No. 4, Jan.-Feb. 1968, p. 3
Phenomena	UFO
Status	Hypothesis

Initial data

Initial information from sources or from an eyewitness

Incident date:

21.11.1967 17:10

Location:

София

Bulgaria

An unknown number of witnesses saw a slow-moving high object emitting pale blue light over the city.

At first it looked like a big ball, then it stopped directly over Sofia and had a trapezoid shape.

The object regained its round shape (as an open parachute or balloon). He had the green light in the form of an arch top, which created a greenish halo with sharp fiery ribbons.

After sunset, the object glowed silver-blue, then orange, and then disappeared over the horizon.

Scientists have ruled out a balloon (moving against the wind) or satellite. Possible high-altitude plastic research probe.

Translated by «Yandex.Translator»

Original news

Nov. 21, 1967; Sofia, Bulgaria
5:10 p.m. LT. An unknown number of witnesses saw a slowly moving, high altitude object emitting a pale blue light over the city. First it looked like a large ball, then it stopped directly over Sofia and had a trapezoid shape. The object resumed its round shape (like an open parachute or balloon). It had a green light in the shape of an arch over the top, which created a greenish halo with sharp, fiery ribbons. After sunset, the object glowed with a silvery-blue color, then orange, before disappearing over the horizon. Scientists ruled out a balloon (moving against the wind) or a satellite. (U.F.O. Investigator, 5 Vol. IV, No. 4, Jan.-Feb. 1968, p. 3.) [Possible high-altitude plastic research balloo

Hypotheses

List of versions containing features matching the eyewitness descriptions or material evidence

Balloon/Weather Balloon

The balloon (simplified is a balloon) — an aircraft lighter than air, where the lift force is used enclosed in a sheath gas (or heated air) with a density less than the density of the surrounding air.

Distinguish between tethered, Svobodnaya and balloons — powered airships.

Events