A loud bang was heard in Moscow, followed by a strange black smoke ring in the sky.

A loud bang was heard in Moscow, followed by a strange black smoke ring in the sky

A strange ring of smoke appeared over Moscow

Caught on video strange black ring in the sky

Strange Lights Appear in Oaxaca Sky

He heard strange noises and decided to confront it.

#VIDEO: Strange lights over the sky of Milan

BThey report from Villahermosa, the appearance of strange red lights in the sky.

#VIDEO: Aliens? Mysterious black ring in the sky captured

Black Smoke Ring over Santa Clara, California

Aliens? Mysterious black ring in the sky captured

Video shows black ring-shaped UFO hovering in the sky at Disneyland sparking theories of an 'alien portal'

Is Katy Perry Engaged To Orlando Bloom

Strange hole forms in the sky

Big Bang Theory takes a bang

Strange sounds in the sky?