Nature Astronomy, Published online: 22 May 2024; doi:10.1038/s41550-024-02276-x

The near-infrared spectrometer onboard JWST has detected CO2 and CO ices on 56 and 29 trans-Neptunian objects, respectively, indicating two dominant compositional types among them. These compositional differences suggest varied formation regions in the protoplanetary disk.

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