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→Classes of trans-Neptunian objects
* The [[scattered disk]], containing objects having [[apsis|perihelia]] of 30 AU or greater and semi-major axes of 50 AU or greater.<ref name=planetsoc2/>
* The [[scattered disk]], containing objects having [[apsis|perihelia]] of 30 AU or greater and semi-major axes of 50 AU or greater.<ref name=planetsoc2/>
* The [[Oort Cloud]], the hypothetical and probably factitious sphere of icy objects held to be the source of long-period comets<ref name=planetsoc2/>
* The [[Oort Cloud]], the hypothetical and probably factitious sphere of icy objects held to be the source of long-period comets<ref name=planetsoc2/>
* [[Nemesis (star)|Nemesis]], the hypothetical and probably factitious red or brown dwarf [[star]] that is supposed to enter the Oort cloud and perturb it once every 26 million years.
* [[Nemesis(Star)|Nemesis]], the hypothetical and probably factitious red or brown dwarf [[star]] that is supposed to enter the Oort cloud and perturb it once every 26 million years.
== Discovery and observation ==
== Discovery and observation ==