Watching clouds is a solitary activity for me, even when I'm surrounded by people. If you have a drink or a meal with me in an outdoor café, my eyes will periodically turn to the sky. Every once ...

From UFO-like rings and whirlpools of light to rainbow clouds and laser lines, here are 10 strange visual phenomena that can be easily explained by science.

Northern lights and noctilucent clouds shining in Alberta skies, June 9. (Image credit: @TheAuroraGuy) Thomas captured the scene using a Nikon D810 camera with a 50mm lens, shooting 1/30-second ...