What is the green flash? It’s often tied to pirate folklore but also commonly occurs in reality – learn what causes the flash and when to see it. The green flash is a rare, brief optical event of ...

On August 19th, what appeared to be ‘seven suns’ appeared during the sunset. This phenomenon is caused by the refraction and dispersion of sunlight through ice crystals in the clouds.

If you enjoyed this article, I’d like to ask for your support. Scientific American has served as an advocate for science and industry for 180 years, and right now may be the most critical moment in ...