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.
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.
because the gravity keeps the giants planets' gases from escaping.
because the gravity keeps the giants planets' gases from escaping.
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.
the gas giant planets have strong gravitational pulls that hold on to their thick atmospheres. Additionally, the high escape velocity prevents the gases from escaping into space. The cold temperatures of these planets also help in maintaining the integrity of their atmospheres.
Jupiter and (sometimes) Neptune.
The Gas Giants have a deep gas atmosphere and earth have a not so deep atmosphere
The Gas Giants have a deep gas atmosphere and earth have a not so deep atmosphere
The Gas Giants have a deep gas atmosphere and earth have a not so deep atmosphere
The gas giant planets have stronger gravity, which makes it harder for anything to escape, and are colder, which means that even with similar gravitational fields, gas molecules might not achieve escape velocity.
A gas giant often has a thick atmosphere composed mainly of hydrogen and helium. These planets typically have no solid surface and may have many moons and planetary rings. They are much larger than terrestrial planets like Earth and are located farther from their host star.