A massive bright orange flash has lit up the sky over Russia's Sverdlovsk region in the Urals on November 14, 2014 at 13:39 UTC (18:39 local time).

The sky above Russia’s remote Sverdlovsk region erupted in light, and despite it having been captured on numerous video recordings—particularly dashboard cameras, it seems—no one seems to know what the flash of light was.

Theories abound, ranging from the reasonable to the completely nonsensical. We’ve collected the most interesting, but first, some of the video footage: