James Webb Telescope Reveals Origins of Trans-Neptunian Objects

• New studies indicate that Trans-Neptunian Objects (TNOs) preserve distinct evidence of their formation regions on their surfaces.
• Researchers utilized data from the James Webb Space Telescope (JWST) and the Hubble Space Telescope to analyze surface colors and size distributions of small TNOs.

TNO Classification

• Cold TNOs: Formed at the edge of the solar system; these objects maintain circular, planar orbits and generally exhibit a reddish surface color.
• Hot TNOs: Formed between the orbits of Uranus and Neptune; they were pushed to the outer solar system during planetary migration. They possess elliptical, tilted orbits and varied color distributions.

Key Findings

• Surface color distinctions remain consistent even among the smallest TNOs, meaning their origin history is physically encoded on them.
• Similar size distributions between hot and cold TNOs suggest both groups experienced comparable collision rates, indicating that their migration to the outer solar system was non-violent.
• Data revealed fewer small TNOs than predicted by current planetary formation models, raising new questions regarding the formation of these small bodies.