the planets have very strong gravitational pulls.
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.
Gases like helium can escape Earth's atmosphere because they have low molecular weight, which allows them to reach escape velocity more easily. Additionally, helium is light enough to be carried away by solar winds, contributing to its escape from the atmosphere.
Other planets may not have atmospheres due to a variety of factors such as their distance from the sun, composition, size, and lack of magnetic field to protect the atmosphere from being stripped away by solar wind. Additionally, some planets may have had their atmosphere stripped away over time due to various geological processes or impacts from celestial bodies.
It is more difficult for gases to escape from Jovian planets because they have much stronger gravitational forces due to their larger mass, which means gases are held more tightly to the planet. Terrestrial planets have lower mass and weaker gravity, making it easier for gases to escape into space.
No, a bullet cannot reach the Earth's atmosphere because it is already on Earth's surface. Bullets are fired from guns on the ground and do not have the velocity or trajectory to escape the planet's gravitational pull and reach space.
The atmosphere is held in place by gravity. Other things being equal, the more massive the planet, the harder it is for a gas molecule to escape into space.
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.
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.
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 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.
Free hydrogen in terrestrial planets' atmospheres can escape due to their low escape velocities, which results in the hydrogen molecules obtaining enough energy to escape the gravitational pull of the planet. This process is known as atmospheric escape, and is more common in lighter elements like hydrogen. Additionally, interactions with the solar wind and ultraviolet radiation can also contribute to the escape of free hydrogen from a planet's atmosphere.
The Exosphere
Gases like helium can escape Earth's atmosphere because they have low molecular weight, which allows them to reach escape velocity more easily. Additionally, helium is light enough to be carried away by solar winds, contributing to its escape from the atmosphere.
The Jovian planets have much higher escape velocities.
No, because the atmosphere keeps in all the oxygen. Without the atmosphere the oxygen would escape.
Because the mass of the planet holds it down.
the atmosphere is important because without the atmosphere the oxygen would escape from our atmosphere into space and without the atmosphere we would all dye because there would be nothing to protect us from the suns heat