How are rainbows formed? How about double rainbows? Are rainbows really circles? Why isn't brown on the rainbow?

 

... We explain like i'm five!

 

Thank you to the r/explainlikeimfive community as always and in particular the following users whose questions and comments formed the basis of this discussion: intangible-tangerine, lastsasquatch, zanelightning, sirherald, dammitcaesar, larae_is_bored & jollyrogerninja

To the ELI5 community that has supported us so far, thanks for all your feedback and comments. Join us on Twitter:

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