While a [[majority]] of clouds form in [[Earth]]'s troposphere, there are occasions where clouds in the [http://en.wikipedia.org/wiki/Stratosphere stratosphere] and [http://en.wikipedia.org/wiki/Mesosphere mesosphere] are observed. Clouds have been observed on [[other planets]] and [[moons]] within the [[Solar System]], but, due to their different temperature characteristics, they are composed of other substances such as [http://en.wikipedia.org/wiki/Methane methane], [http://en.wikipedia.org/wiki/Ammonia ammonia], and [http://en.wikipedia.org/wiki/Sulfuric_acid sulfuric acid].[http://en.wikipedia.org/wiki/Cloud] | While a [[majority]] of clouds form in [[Earth]]'s troposphere, there are occasions where clouds in the [http://en.wikipedia.org/wiki/Stratosphere stratosphere] and [http://en.wikipedia.org/wiki/Mesosphere mesosphere] are observed. Clouds have been observed on [[other planets]] and [[moons]] within the [[Solar System]], but, due to their different temperature characteristics, they are composed of other substances such as [http://en.wikipedia.org/wiki/Methane methane], [http://en.wikipedia.org/wiki/Ammonia ammonia], and [http://en.wikipedia.org/wiki/Sulfuric_acid sulfuric acid].[http://en.wikipedia.org/wiki/Cloud] |