Trans-Neptunian Objects Study

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NASA’s Webb Reveals the Ancient Surfaces of Trans-Neptunian Objects

Summary

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86% Informative

Trans-Neptunian objects (TNOs) are icy bodies ranging in size from Pluto and Eris (dwarf planets with diameters of about 1,500 miles ) down to tens of miles ( Arrokoth ) and even smaller.

The orbits of TNOs are extremely diverse but fall into groupings that reflect the outward migration of Uranus and Neptune early in the history of the formation of the solar system.

James Webb Space Telescope is expanding our knowledge of these objects.

The DiSCo-TNOs team hypothesizes that these different spectral types are the result of higher temperatures closer to the Sun , and colder temperatures farther out.

Bowl-type spectra are dominated by the absorption features of water ice, with some carbon dioxide ice, and indications of silicate-rich dust.

Double-dip spectra have absorption features due to complex organic molecules, carbon dioxide, and carbon monoxide ices.

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