You're asking about the atmosphere of the entire solar system, which is a bit tricky because it doesn't have a single, unified atmosphere like Earth. Instead, we have individual atmospheres surrounding each planet, moon, and even the Sun itself!

Here's a breakdown of the most common gases found in the atmospheres of the different bodies in our solar system:

Sun:

* Hydrogen (H) - The most abundant element, makes up about 70% of the Sun's mass.

* Helium (He) - Makes up about 28% of the Sun's mass.

* Trace amounts of other elements - Including oxygen, carbon, neon, iron, and silicon.

Planets:

* Earth: Nitrogen (N2), Oxygen (O2), Argon (Ar), Carbon Dioxide (CO2)

* Venus: Carbon Dioxide (CO2), Nitrogen (N2)

* Mars: Carbon Dioxide (CO2), Nitrogen (N2), Argon (Ar)

* Jupiter: Hydrogen (H2), Helium (He), Methane (CH4), Ammonia (NH3)

* Saturn: Hydrogen (H2), Helium (He), Methane (CH4), Ammonia (NH3)

* Uranus: Hydrogen (H2), Helium (He), Methane (CH4)

* Neptune: Hydrogen (H2), Helium (He), Methane (CH4)

Moons:

* Titan (Saturn's moon): Nitrogen (N2), Methane (CH4), Hydrogen (H2), Argon (Ar)

* Europa (Jupiter's moon): Very thin atmosphere, likely oxygen (O2)

* Io (Jupiter's moon): Sulfur dioxide (SO2)

* Ganymede (Jupiter's moon): Oxygen (O2), Ozone (O3), Sodium (Na)

Other:

* Interstellar medium: Mostly Hydrogen (H) and Helium (He), with trace amounts of other elements.

Important Notes:

* The composition of each atmosphere varies widely depending on the body.

* The presence and abundance of certain gases can be used to learn about a body's formation and evolution.

* Many of these atmospheres are very thin or even negligible compared to Earth's.

Let me know if you have any more questions about specific planets or moons!