A Curious Blue Swirl of Light Captivates Sky Watchers in Europe 1:07 0:43 14:22 Two Astronauts on an 8-Day Mission That Turned Into a 9-Month Odyssey 2:05 0:36 2:58 1:03 0:33 0:22

The strange phenomenon lit up the night sky above large parts of Sweden on Monday evening. People in Halland, Skåne and Stockholm all reported seeing the blue spiral, according to media reports. But reports have also come from people in Slovenia, Poland, Italy, UK and Ireland.