A rare and glorious display light up the skies above Indonesia. Image: @sipa5402 via TikTok Get the Popular Science daily newsletter💡 Breakthroughs, discoveries, and DIY tips sent six days a week. This colorful cloud over Jonggol, Indonesia , is not a portal to the land of Oz. Or the rainbow road into Asgard from Norse mythology. Or even an AI -generated image. They are iridescent clouds , a rare type of cloud that appear when raindrops interact with sunlight.  According to WABC meteorologist Lee Goldberg , the small water droplets or ice crystals inside of the cloud scatter sunlight, diffracting the light into a spectrum of colors. The rainbow effect is most visible when the sun is partially blocked by something like a mountain or thicker clouds.   “These vibrant displays usually appear near the sun and can last for only a few moments—making them a truly magical sight for anyone lucky enough to catch them,” Goldberg writes.…