The atmoshere is the air around a planet, so it becomes part of the solar system
There is no atmosphere for the solar system, space has no air
Mercury has no atmosphere.
Uranus is related to the solar system because it is a planet.
Titan, the largest moon of Saturn, has the most substantial atmosphere in our solar system.
But ... there are many bodies in our Solar system that have no atmosphere.
The planets, except for mercury it has no atmosphere
Mercury has no atmosphere.
The solar system doesn't have an atmosphere, it occupies a piece of space which is an empty vacuum. Each planet may have its own atmosphere, a layer of gas at the surface.
Titan is the only satellite in the solar system to have a substantial atmosphere. Others do have very tenuous atmosphere, but Titant's atmosphere is even denser than Earth's.
Titan, a moon of Saturn, is the largest satellite in the solar system and has a substantial atmosphere. It is the only moon in the solar system known to have a dense atmosphere, composed mostly of nitrogen with traces of methane and ethane.
Because it has an atmosphere.
Mercury.