Rainbows

We usually see rainbows when it rains with the sun behind us.

Sunlight contains seven different colours.

Each colour exits at a different angle. There are different rainbows all around us but we only see one of the parts at a time.

The reason why some clouds are black is because the sun reflects onto it. The reason why we see it on a plane light is because the sunlight only hits the top.

On a different planet it might rain diamonds. Black holes are formed.