Rainbows are a circle, but you don’t see the bottom half of it because the ground is in the way.[ It’s possible to see it from an airplane though.](https://www.thetelegraphandargus.co.uk/resources/images/12594594/?type=responsive-gallery-fullscreen)
The middle part is actually also a part of the rainbow, we just can’t see it because it’s ultraviolet color and our eyes can’t sense that (also the atmosphere blocks a lot of it from even coming down)
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