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Many Milky Way planets may be composed of diamond

There may be a number of exoplanets in our galaxy that could have been formed with a high carbon-to-oxygen ratio, allowing them to be made of mostly diamond, a study in The Planetary Science Journal suggests. Researchers -- who tested samples of silicon carbide that had been immersed in water in a diamond anvil cell and exposed them to extreme pressures then heated them with lasers -- found they were converted into silica and diamond.

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