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That is the Oort Cloud.That is the Oort Cloud.That is the Oort Cloud.That is the Oort Cloud.
the oort cloud is mostly black
The Oort cloud.
However, technically the Oort cloud IS part of our Solar System.
See related link for more information.
The outer Oort cloud. (The inner Oort cloud is believed to be disk-shaped.)
Oort cloud