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Rigorous Science

To make a blue moon, what element does it need?

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We know that Mars has a reddish color, because its ground consists of iron-based compounds. The moon is grey-whiteish because it consists mostly of silicon-based compounds.

What element should the moon in my world have in order to have a blue color?

I thought about cobalt-based compounds, but naturally this element is silver-grey.

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This post was sourced from https://worldbuilding.stackexchange.com/q/139889. It is licensed under CC BY-SA 4.0.

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