Gas giant planets are just that, they have no solid surface. This means that the rotation of the planet happens at different speeds as on moves from the equator to the poles.
A "Gas Giant" planet.
Where a planet or moon has an atmosphere, it is the gravity of the moon or planet that holds the atmosphere on the planet or moon.
The Gas Giants have a deep gas atmosphere and earth have a not so deep atmosphere
Jupiter because it is a giant gas ball but the core is a liquid
That is commonly called a gas giant.
The main element found in the atmosphere of a gas giant planet like Jupiter or Saturn is hydrogen. This element makes up the majority of their composition, along with other gases like helium, methane, and ammonia.
Gas giant planet.
Mercury is a rocky planet and is too close to the sun to retain much of an atmosphere, much less become a gas giant.
Neptune is a gas giant, primarily composed of hydrogen and helium, with a thick atmosphere of methane, which gives it a blue color. It is the eighth and farthest planet from the sun in our solar system.
Gas particles (atoms, molecules) composing the atmosphere of a planet have a mass, therefore they are trapped by the gravitational field of the planet. This is not only true for giant planets but applies to all planets with atmosphere.
For the same reason that our atmosphere on Earth does not escape into space - gravity.
Neptune is a gas giant planet in our solar system, primarily composed of hydrogen and helium. It is the eighth and farthest planet from the Sun. Neptune's atmosphere is known for its dynamic weather patterns, including the fastest winds in the solar system.