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Crushing planetary pressures transform atmospheric methane into falling diamonds. The figure is taken from NASA Science, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

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It rains diamonds deep inside Uranus and Neptune

Crushing planetary pressures transform atmospheric methane into falling diamonds

Thousands of kilometres beneath the cloud tops of Uranus and Neptune, extreme heat and pressure squeeze atmospheric methane molecules, splitting carbon from hydrogen. The intense pressure crystallises carbon into diamonds, which sink through liquid mantle layers like diamond hail.

Voyager 2 Neptune and Triton — NASA / Jet Propulsion Lab · Public domain · source

Where this comes from

NASA Science

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Tags: diamonds, uranus, neptune

It rains diamonds deep inside Uranus and Neptune: the short answers

Where does this come from, and can I check it?: Crushing planetary pressures transform atmospheric methane into falling diamonds. The figure is taken from NASA Science, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a space fact?: Yes. It sits on the Space shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.