"Why are there so many songs about rainbows?" sings Kermit the Frog in a song (about rainbows) called "Rainbow Connection" from 1979's "The Muppet Movie." And it's not just songs that feature rainbows ...

Viewers shared a few photos of the spectacle sight showing the double rainbow arching over stores and homes. Rainbows form when sunlight is scattered by water droplets through refraction.

This is called refraction. This can happen in raindrops ... So when the sun is behind you and the rain in front of you, you see a rainbow of colours reflected back from inside the raindrops.