Filmed here over the city of Omsk, the meteor - or was it a rocket or test firing of a ballistic missile? - startled people over a swathe of territory.
Photographs show red lights hovering about the ground and then moving vast distances in less than one minute.
Social media claims aliens were inspecting Siberia in spacecraft that constantly changes shape.
A meteor? A rocket? A military missile? An UFO? So far no explanation for the lightshow over Trans-Baikal.
As usual there is outlandish speculation about an alien visit, but there is genuine puzzlement and disagreement among experts over the mystery object.
Elsewhere in Buryatia, close to Lake Baikal, there are reports of other strange sightings.
Andrey Solovyev keeps a lonely all-winter vigil in Yakutia in search of the legendary Labynkyr Devil.
The meteorite that crashed to Earth in the Urals was attacked by a UFO causing it to explode and shatter, it was claimed on Thursday.
A Moscow scientist is calling for a new scientific expedition to solve the mystery of a huge 'monster'.
Sightings of 'primeval monsters' in Siberia's Lake Labynkyr were made before 'Nessie' was spotted in Scotland.