Uranus

<p><strong>Uranus</strong> (from the Latin name <em>Ūranus</em> for the Greek god <a title= "Uranus (mythology)" href= "https://en.wikipedia.org/wiki/Uranus_(mythology)">Οὐρανός</a>) is the seventh <a title="Planet" href= "https://en.wikipedia.org/wiki/Planet">planet</a> from the <a title="Sun" href= "https://en.wikipedia.org/wiki/Sun">Sun</a>. It has the third-largest planetary radius and fourth-largest planetary mass in the <a title="Solar System" href= "https://en.wikipedia.org/wiki/Solar_System">Solar System</a>. Uranus is similar in composition to <a title="Neptune" href= "https://en.wikipedia.org/wiki/Neptune">Neptune</a>, and both have bulk chemical compositions which differ from that of the larger <a title="Gas giant" href= "https://en.wikipedia.org/wiki/Gas_giant">gas giants</a> <a title="Jupiter" href= "https://en.wikipedia.org/wiki/Jupiter">Jupiter</a> and <a title="Saturn" href="https://en.wikipedia.org/wiki/Saturn">Saturn</a>. For this reason, scientists often classify Uranus and Neptune as "<a title= "Ice giant" href="https://en.wikipedia.org/wiki/Ice_giant">ice giants</a>" to distinguish them from the gas giants. Uranus' <a title="Atmosphere" href= "https://en.wikipedia.org/wiki/Atmosphere#Others">atmosphere</a> is similar to Jupiter's and Saturn's in its primary composition of <a title="Hydrogen" href= "https://en.wikipedia.org/wiki/Hydrogen">hydrogen</a> and <a title="Helium" href="https://en.wikipedia.org/wiki/Helium">helium</a>, but it contains more "<a title="Volatiles" href= "https://en.wikipedia.org/wiki/Volatiles">ices</a>" such as water, <a title="Ammonia" href= "https://en.wikipedia.org/wiki/Ammonia">ammonia</a>, and <a title="Methane" href= "https://en.wikipedia.org/wiki/Methane">methane</a>, along with traces of other <a title="Hydrocarbon" href= "https://en.wikipedia.org/wiki/Hydrocarbon">hydrocarbons</a>.<sup id="cite_ref-Lunine_1993_18-2" class="reference"><a href= "https://en.wikipedia.org/wiki/Uranus#cite_note-Lunine_1993-18">[14]</a></sup> It has the coldest planetary atmosphere i