I saw this article and something really wierd came in my mind.

What would the sky look like on those planets of our solar system where rainfall of diamonds occur? Will it be full of rainbows? Has it been ever captured?

I don't know whether it will be full of rainbows or not but there can be surely more than two rainbows which we rarely observe here on the Earth 🌎 because of multiple reflection of light inside the diamonds.

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    $\begingroup$ What planets are those? $\endgroup$ – Adrian Howard Sep 24 '20 at 18:24
  • $\begingroup$ @Adrian Howard may be Uranus and Neptune. $\endgroup$ – Ankit Sep 25 '20 at 2:49

Unlikely. The strong primary rainbow on earth happens because the sun location and the water locations are limited. If you tried to make a sky full of rainbows, it would just smear together into white.

Ice crystals commonly form in earths atmosphere. Like diamonds, and unlike water droplets, these disperse light in different directions depending on the orientation of the crystal. Because in most situations there is no orientation to the crystals, all colors go in all directions, and the overall impression is white. This is the same thing that happens in foams and snow. Further, we see a rainbow because there is little rain between us and the edge of the rain area. If the rain were everywhere in the sky, the light would rebound around and you'd get the white of clouds.

There is a type of ice rainbow that can happen when a type of hexagonal ice forms, and then orients itself face up as it falls. This directionality allows them to disperse in a particular direction and such ice rainbows are possible. Sky diamonds would need some sort of orientation mechanism to do the same thing.

All told, you could possibly get diamond rainbows in the same way you get ice rainbows on earth. But a sky full of diamonds would probably look white (assuming white light), not spectacularly colorful.

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    $\begingroup$ Beat me to it! The "ice rainbows" you're referring to are (I think) usually called sun dogs, if the OP wants to read more about them. Note that their colors are rather muted (since the crystals aren't all perfectly oriented), and they don't generally form full arcs (since the crystalline refraction is highly direction-dependent.) $\endgroup$ – Michael Seifert Sep 24 '20 at 19:31
  • $\begingroup$ I couldn't remember, but I think en.wikipedia.org/wiki/Circumhorizontal_arc is what I was thinking of. $\endgroup$ – BowlOfRed Sep 24 '20 at 19:34

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