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The hydrogen and helium form visible clouds that glide along the surface of the planets, which can be seen through a telescope from Earth. These elements also form liquids and solid ice beneath the clouds because of the low temperatures and extreme pressure.
Hydrogen and helium are the most common elements in the solar system, so it's not surprising that these are the elements that make up the majority of the outer planets.
The composition of outer planets also 
includes hydrogen compounds, such as methane, ammonia, ammonium hydrosulfide, benzene and water. 

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