Changes

Pluto has an elliptical orbit.  It is usually further from the sun than any of the eight planets, but there are times due to its odd orbit when it is closer than [[Neptune]].<ref>http://science.jrank.org/pages/5352/Pluto.html</ref>

Pluto has an elliptical orbit.  It is usually further from the sun than any of the eight planets, but there are times due to its odd orbit when it is closer than [[Neptune]].<ref>http://science.jrank.org/pages/5352/Pluto.html</ref>

== Problems for evolutionary theory ==

== Pluto's Origin ==

Pluto was initially supposed to have been a [[moon]] of [[Neptune]]<ref>http://www.britannica.com/eb/article-54312/Pluto</ref>. But with the discovery of [[Charon]] in 1978, and the subsequent discoveries of its other moons [[Hydra (moon)|Hydra]] and [[Nix]], that theory became far less plausible.

Pluto was initially supposed to have been a [[moon]] of [[Neptune]]<ref>http://www.britannica.com/eb/article-54312/Pluto</ref>. But with the discovery of [[Charon]] in 1978, and the subsequent discoveries of its other moons [[Hydra (moon)|Hydra]] and [[Nix]], that theory became far less plausible.