Footage shows the circular rainbow surrounding the plane's shadow, illuminating the sky in Phrae, Thailand on December 27. Passengers on board were stunned as they witnessed the rare phenomenon.
Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to curiouskidsus@theconversation.com. Can rainbows form in a circle? – Henry D., age 7 ...