Changes

Since 1951, when [[Gerard P. Kuiper]] published his original hypothesis concerning non-accreted icy remnants of the [[nebula hypothesis|solar nebula]], trans-Neptunian objects, by whatever name, have been held to be the source of [[comets]], of periods long or short.

Since 1951, when [[Gerard P. Kuiper]] published his original hypothesis concerning non-accreted icy remnants of the [[nebula hypothesis|solar nebula]], trans-Neptunian objects, by whatever name, have been held to be the source of [[comets]], of periods long or short.

=== Origins ===

=== Origins ===

All these objects (except for the hypothetical [[Nemesis]]) are supposed to be remnants of the formation of the [[solar system]] that could not accrete into planets. Most of these objects, except for the most distant objects in the [[scattered disk]], are supposed to have moved into their present orbits under the gravitational influence of [[Neptune]].

All these objects (except for the hypothetical [[Nemesis(Star)|Nemesis]]) are supposed to be remnants of the formation of the [[solar system]] that could not accrete into planets. Most of these objects, except for the most distant objects in the [[scattered disk]], are supposed to have moved into their present orbits under the gravitational influence of [[Neptune]].

== Classes of trans-Neptunian objects ==

== Classes of trans-Neptunian objects ==