It's hard for us to think of something like 'air' as being physical matter, not completely unlike iron or gold. Gas is physical matter, and not only does it behave like matter in a gravitational field, it has gravity. If you have enough gas all in one place, you have a lot of gravity.
A gas giant has much stronger gravity to contain those gasses. Additionally, the gas giants in our solar system are much farther from the sun than Mercury and therefore colder. This gives the gas less energy with which to escape. We have found gas giants in other solar systems orbiting very close to their stars. The broiled atmospheres of those planets are escaping and will take several million years to leave their planets completely.
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.
The moon's escape velocity is lower than the average velocity of gas particles in its atmosphere, so the moon cannot retain an atmosphere as the gas particles would escape into space. This is why the moon has no significant atmosphere.
Neptune is the smallest gas giant in our solar system.
That cant be answered because space is almost infinite and we have no knowledge on how many gas giants there are (but there must be over a million millions) let alone how big every single one is. So simply put there is no answer to your question.
No. A gas giant, as the term implies, is made of gas and has no solid surface.
For the same reason that our atmosphere on Earth does not escape into space - gravity.
because the gravity keeps the giants planets' gases from escaping.
because the gravity keeps the giants planets' gases from escaping.
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.
it's small size and low gravity
It feels bad about how ugly it looks stupid. DAH
gravity keeps the giants planet's gasas from escaping
because if u have enough gas in one area it creates mass and causes it to stay in the gravity field of a planet
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.
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.
You cant land on a gas giant But probes have gone "inside" gas giants
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.