<p>When the sun is low in the horizon, early or late in the day, a rainbow can be limited to reds and yellows.</p>

Red Bows

When the sun is low in the horizon, early or late in the day, a rainbow can be limited to reds and yellows.

Photograph by Nick Norman, National Geographic

Some Rainbows Don’t Have Every Color of the Rainbow

There are at least 12 kinds of rainbows, a new study reveals, and some skip a color or two.

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