article_snippet: A mysterious silent flash which lit up the Russian night sky has baffled people and sparked theories of extraterrestrial activity.
article_snippet: Experts have said the blue and white burst of light, which illuminated Stavropol in southern Russia, is not natural.
article_snippet: A mysterious silent flash lit up the night sky in Stavropol, southern Russia, in the early hours of the morning .
article_snippet: This is not the first time that strange lights have been recorded in Russia.
article_snippet: In November last year, an unexplained 11 second flash took place in Yekaterinburg.
highlights_snippet: Mystery silent flash illuminates the sky in Stavropol in southern Russia .
  