Fire in the sky: Multi-colored UFO cloud appears over São Paulo, Brazil

A rare sky phenomenon above the state of São Paulo, Brazil has delighted people.

The multi-colored glow appeared in the sky on May 19, 2018 and it was likely a fire rainbow, which occurs when sunlight refracts through ice-crystal clouds.

Others have said it could have been cloud iridescence, which happens when water droplets or crystals scatter light, or could it be an earthquake light? Anyway it remains a very strange phenomenon.