Talk:Werepig/@comment-75.170.244.38-20130813193435/@comment-24502344-20131029183148

Uranus is the seventh  planet from the  Sun. It has the third-largest planetary radius and fourth-largest planetary mass in the  Solar System. Uranus is similar in composition to  Neptune, and both are of different chemical composition than the larger  gas giants  Jupiter and  Saturn. For this reason, astronomers sometimes place them in a separate category called " ice giants". Uranus's atmosphere, although similar to Jupiter's and Saturn's in its primary composition of  hydrogenand  helium, contains more " ices" such as water,  ammonia, and  methane, along with traces of  hydrocarbons. [12] <span style="color:rgb(0,0,0);font-family:sans-serif;line-height:19.1875px;"> It is the coldest planetary  atmosphere<span style="color:rgb(0,0,0);font-family:sans-serif;line-height:19.1875px;"> in the  Solar System<span style="color:rgb(0,0,0);font-family:sans-serif;line-height:19.1875px;">, with a minimum temperature of  <span style="color:rgb(0,0,0);font-family:sans-serif;line-height:19.1875px;white-space:nowrap;">49 K <span style="color:rgb(0,0,0);font-family:sans-serif;line-height:19.1875px;">  <span style="color:rgb(0,0,0);font-family:sans-serif;line-height:19.1875px;white-space:nowrap;">(−224.2 °C) <span style="color:rgb(0,0,0);font-family:sans-serif;line-height:19.1875px;">, and has a complex, layered  cloud<span style="color:rgb(0,0,0);font-family:sans-serif;line-height:19.1875px;"> structure, with water thought to make up the lowest clouds, and methane the uppermost layer of clouds. <sup class="reference" id="cite_ref-Lunine_1993_15-3" style="line-height:1em;unicode-bidi:-webkit-isolate;color:rgb(0,0,0);font-family:sans-serif;">[12] <span style="color:rgb(0,0,0);font-family:sans-serif;line-height:19.1875px;"> In contrast, the interior of Uranus is mainly composed of ices and rock. <sup class="reference" id="cite_ref-Podolak_Weizman_et_al._1995_14-1" style="line-height:1em;unicode-bidi:-webkit-isolate;color:rgb(0,0,0);font-family:sans-serif;">[11]