Changes

== Physical characteristics ==

== Physical characteristics ==

Titan is slightly larger in radius than [[Mercury]] (and [[Earth]]'s [[Moon]]), and is more massive than any of the [[dwarf planets]] [[Eris]], [[Pluto]], and [[Ceres]] by one to two orders of magnitude. Titan was once thought to be the broadest of all satellites, but the [[Voyager 1]] probe showed that Titan's large apparent diameter was due to its atmosphere, and in fact [[Ganymede]] is slightly larger in radius than is Titan.<ref name=Arnett>Arnett, Bill. "[http://www.nineplanets.org/titan.html Entry for Titan]." ''The <s>Nine</s> 8 Planets'', May 27, 2005. Accessed February 16, 2008</ref>.

Titan is slightly larger in radius than [[Mercury]] (and [[Earth]]'s [[Moon]]), and is more massive than any of the [[dwarf planet]]s [[Eris]], [[Pluto]], and [[Ceres]] by one to two orders of magnitude. Titan was once thought to be the broadest of all satellites, but the [[Voyager 1]] probe showed that Titan's large apparent diameter was due to its atmosphere, and in fact [[Ganymede]] is slightly larger in radius than is Titan.<ref name=Arnett>Arnett, Bill. "[http://www.nineplanets.org/titan.html Entry for Titan]." ''The <s>Nine</s> 8 Planets'', May 27, 2005. Accessed February 16, 2008</ref>.

Titan's bulk is probably half water ice and half rock, in several layers with a rock center and several layers of various crystalline forms of ice.<ref name=Arnett/>

Titan's bulk is probably half water ice and half rock, in several layers with a rock center and several layers of various crystalline forms of ice.<ref name=Arnett/>