Ball lightning is a rare, unexplained, luminous spherical phenomenon, typically seen during thunderstorms, which varies in size, color, and intensity and can last from seconds to minutes. While most scientists agree ball lightning is a real phenomenon, the cause remains a mystery, though theories involve silicon vaporizing from the soil to form a plasma ball or other plasma-related phenomena. Credit: tt/sundayannab1 | ROADS.sg

The centuries-old phenomenon of ball lightning, which scientists are trying to understand, is claimed to have been caught on camera in Russia. | WAtoday.com.au