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.
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.
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.