Neptune

…Belt and the small bodies beyond Neptune. The conversation explores what these distant objects can reveal about the Solar System’s formation and evolution. This is the explicitly labelled revisited edition published in September 2026.

…It contrasts Neptune's behaviour during planetary instability with simpler gradual-migration scenarios. The distribution of distant small bodies provides constraints on the dynamical history of the giant planets.

…associated with Jupiter or Neptune.

…a possible additional planet beyond Neptune.

The Kuiper belt contains a complex collection of bodies beyond Neptune, including Pluto. This lecture compares dynamically cold and excited populations, resonant objects, scattered bodies and detached remnants. Their orbital structure provides a record of the Solar System's past evolution.