A new study of carbon monoxide in the two giant planets suggests that Neptune’s building blocks came from a different part of the young Sun’s protoplanetary disk and traveled a long distance before settling.
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Neptune built itself from the outer disk while Uranus stayed closer in? Fine, but the carbon monoxide readings are still the only evidence, and that’s a thin thread to hang a whole solar-system origin story on.
Carbon monoxide in two planets, and suddenly we know where they were born? Show me the sample size first.
