A long, wide rainbow

This is another rainbow picture that I found. What a sight!

It’s not shaped like a bow, and it’s not circular. It’s just long and wide. In this case the cloud is not a gas, and actually consists of very small pieces of ice. The sunlight on the ice produces the rainbow.

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Rainbow from above the clouds

In his comment to Quick Quiz XXV dragonlife replied with another quiz, an excellent question: what does a rainbow look like when seen from above, for example from an airplane.

I admit that I didn’t know, so I did some research and found this photo taken from an airplane above the clouds.

rainbow.jpg

Maybe you can just see a circular rainbow on the clouds. This is a very unusual sight. I hope this is the right answer dragonlife!