What is the difference between a trans-Neptunian object and a Kuiper Belt object?

Trans-Neptunian Objects (TNOs) and Kuiper Belt Objects (KBOs) are two different types of objects that exist in the outer Solar System beyond the orbit of Neptune. TNOs and KBOs share some similarities but also have some key differences that distinguish them.

TNOs are a class of minor planets that have a semi-major axis greater than that of Neptune, which means they are located farther from the Sun than Neptune. TNOs are divided into two groups: the Kuiper Belt Objects (KBOs) and the scattered disc objects (SDOs). KBOs are objects that are located within the Kuiper Belt, a region of the Solar System that is home to many icy objects. SDOs have highly elliptical orbits that take them far away from the Kuiper Belt.

The Kuiper Belt is a disk-shaped region of the Solar System that extends from the orbit of Neptune out to about 50 astronomical units (AU) from the Sun. KBOs are found within this region, and they are generally small, icy objects that are thought to be remnants from the formation of the Solar System. Some of the largest KBOs, such as Pluto, are classified as dwarf planets.

Overall, while both TNOs and KBOs are located in the outer Solar System and share some similarities, the Kuiper Belt is a specific region within the outer Solar System that contains many icy objects, including KBOs.