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Oort Cloud
Class: Belt Group, Circumstellar Class
An Oort Cloud tends to completely surround a star system at a distance of thousands to hundreds of thousands of A.U. Unlike discs, an Oort Cloud tends to be more three dimensional, enclosing the system in a bubble of icy comets.
Due to the vast distances between individual comets, an Oort Cloud tends to be a cold, lonely place.
Some systems have two distinct Oort Clouds, an inner cloud (termed OI) and an outer cloud (termed OO). Smaller systems may simply have an inner (OI) cloud.
Around a Sol-mass star, the OI cloud can be found about 10,000 AU from the star, with a radius of about 5,000 AU. The outer cloud is about 30,000 AU distant, with a 10,000 AU radius.