Answer
TNOs, or trans-Neptunian objects, are icy bodies that orbit the Sun beyond the orbit of Neptune. They are divided into two main groups: the Kuiper Belt, which is a disk of icy bodies that extends from about 30 to 50 AU from the Sun, and the Oort Cloud, which is a vast reservoir of icy bodies that extends from about 50,000 to 100,000 AU from the Sun.