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By Samuel López | USA Herald - A sky over Jonggol, Indonesia, recently looked so unreal that millions of people did what people now instinctively do in the age of artificial intelligence. They questioned whether their own eyes were being deceived.

The viral image showed a towering cloud wrapped in electric bands of pink, blue, green, yellow, and violet. It looked cinematic. It looked mythological. It looked like something pulled from a fantasy film, a digital art prompt, or an AI-generated dreamscape. But according to meteorological explanations cited in reporting on the event, the cloud was real, and the phenomenon has a name that sounds almost as beautiful as the image itself: cloud iridescence. 

That matters because this story is not just about a beautiful sky. It is about public trust, scientific literacy, viral misinformation, and the growing problem of living in a world where real events are now immediately suspected of being fake.

According to NOAA, so-called “rainbow clouds” occur because of cloud iridescence, a natural optical phenomenon caused when sunlight is scattered by small water droplets or tiny ice crystals inside a cloud. The key process is diffraction, which can split sunlight into visible color bands when the cloud particles are small, thin, and similar in size. NOAA explains that these displays are relatively rare because the cloud must be thin and contain many droplets or ice crystals of about the same size. 

That is the science. But the social reaction tells a different story.

The Indonesian cloud went viral because it looked impossible. Some online viewers reportedly questioned whether the footage was artificial intelligence, edited video, or some kind of staged visual effect. Popular Science reported that the cloud appeared over Jonggol, southeast of Jakarta, and was not a portal, a fantasy image, or AI. It was an iridescent cloud, formed through sunlight interacting with water droplets or ice crystals. 

WABC meteorologist Lee Goldberg explained that small droplets or ice crystals inside the cloud diffract sunlight into a spectrum of colors, and that the effect is often most visible when the sun is partially blocked by a mountain, thicker clouds, or another obstruction. He also noted that these displays can appear near the sun and last only briefly, which helps explain why the footage felt so extraordinary to people who saw it in real time. 

Indonesia’s meteorological explanation also matters. Ida Pramuwardani, Acting Director of Public Meteorology at Indonesia’s BMKG, reportedly told Detik News that a towering cumulus cloud blocked part of a rainbow, creating an incomplete visual that appeared to some viewers like a “rainbow cloud.” In other words, what looked supernatural was likely the result of sunlight, moisture, cloud structure, and viewing angle all lining up at once.