article_snippet.sent: Eerie footage has emerged showing a mysterious 100 metre-wide black ring of smoke floating over clear skies in Kazakhstan - convincing locals it was caused by a UFO.
article_snippet.sent: : Eerie footage shows a mysterious 100 metre-wide black ring of smoke floating over clear skies in Kazakhstan - convincing locals it was caused by a UFO .
article_snippet.sent: It dissipated like smoke, but It was completely odourless.'
article_snippet.sent: Within minutes of the video being shared online, Youtube users began to question whether the thick black hoop was an alien spacecraft, while others suggested it might just be cigarette smoke immediately in front of the camera but giving the perception it is in the sky.
article_snippet.sent: Speaking to Russia Today, Andrey Solodovnik - associate physics professor at the Northern Kazakhstan State University - dismissed suggestions the cloud was caused by aliens.
article_snippet.sent: Andrey Solodovnik - associate physics professor at the Northern Kazakhstan State University - dismissed suggestions said that based on similar clouds seen in the skies in recent years, the giant black hoop was likely to have been little more than a smoke ring generated by combustion at nearby factories.
article_snippet.sent: Plenty of industrial machinery is known to create ring-shaped clouds of smoke, though these are usually lighter-coloured, considerably less dense and vanish in just one or two minutes.
highlights_snippet.sent: The perfect hoop shape sat in the air not moving for more than 15 minutes .
  