Main page: Asteroids (theoretical models) The Oort Cloud is the outermost region of the Solar System. We have never seen any object inside the Oort Cloud. Its existence is known only from theoretical models. All we know is the presence of some very long period comets that are supposed to have originated there. Other stars might also have an Oort Cloud. Also, similar objects might exist and form on their own in the interstellar environment.
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