Spectacular blue spiral light brightens up night sky, likely from Space X rocket

A mysterious spiraling blue light illuminated the night skies over Europe on Monday.

The cosmic whirlpool was captured in stunning video and appears to have been created by the SpaceX Falcon 9 rocket booster falling back toward Earth, according to experts.

Time-lapse video taken from Croatia at around 4 p.m. EST, or 9 p.m. local time, shows the glowing light spinning across the sky in what many social media commentators likened to a spiral galaxy. The full video at normal speed lasts for about six minutes.

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The Met Office in the U.K. said it had received many reports of an "illuminated swirl in the sky" and said it was likely caused by the...