Oort cloud

The Oort cloud, named after the Dutch astronomer Jan Oort, sometimes called the Öpik–Oort cloud, is a theoretical cloud of predominantly icy planetesimals proposed to surround the Sun at distances ranging from 2,000 to 200,000 au.

The Oort Cloud is far beyond the Kuiper belt where most of the Dwarf planets have been found (Pluto is a Kuiper belt object)

Oort Cloud

What Is The Oort Cloud?