Why is the sky blue on Earth, yet space appears pitch black? This video uncovers the science behind one of nature’s most ...

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.

A weird blue spiral of light, captured on photo in the night sky? As much as we might want it to be, we know by now that it's not aliens (it's never aliens, OK?).