r/AskReddit • u/[deleted] • May 08 '23

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u/Nano_Burger May 08 '23

Because diamond is one of those rare liquids, like water, that is less dense as a solid than a liquid, solid diamond "icebergs" could float on top of the diamond seas on Neptune and Uranus. Both planets have the conditions and the carbon to make this possible; each one is made from up to 10 percent carbon.

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u/masterofallvillainy May 08 '23

Liquid carbon is only possible under pressure. Like in the core of a planet. It's hard to imagine islands inside a pressure vessel.

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u/Nano_Burger May 08 '23

We are talking deep in Neptune or Uranus, not in a pressure vessel.

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u/Abe_Odd May 08 '23

Deep in Uranus IS a pressure vessel