When you think of strange light phenomena, the first things that likely come to mind are rainbows, aurora borealis, or halos around the Sun. While at any given moment, you’re probably not going to look outside and see any of these things, there are other events that have dumbfounded people for years.
Our world has played host to a wide array of optical oddities. The origins of these strange lights aren’t immediately apparent, and they have both spawned legends and brought scientific inquiry. Explanations have been given for some; others remain not very well-understood.