Gersaschenko captioned the video: "Residents of Moscow publish videos of a black circle in the city's sky. What do you think happened here?" Residents of Moscow publish videos of a black circle in ...

The ominous black circle, which sat in between the clouds, quickly caused widespread speculation and confusion as people took to social media to share clips and images of the odd occurrence.

Spin The Black Circle’s dizzying pace directly played into that, as he explained to Rolling Stone in 2003. “I was trying to make the music I wanted to be making,” he told David Fricke.

Lumbering like a giant “iron bloke” out of the hardscrabble English city of Birmingham, Black Sabbath created a dark new style of rock, and every metal band that followed owes them a huge debt.