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Air has mass, and gravity pulls anything with mass. The gravity of the earth "pulls" air down towards it's center.
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∙ 12y ago
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Does outer space have an atmosphere?
No, it's the other way around: atmosphere needs gravity to stay on a planet. Artificially, pressurized compartments can maintain atmosphere though. Such is the case on the International Space Station.
Does the air in the thermosphere get thinner and thinner until it fades into space?
Yes - the further away from the Earth's surface you travel - the less gravity there is to hold air molecules around the planet. Eventually, the gravitational pull is so weak, that air molecules can simply 'drift off' into space. Fortunately - enough air is held around the Earth by gravity, to sustain life !
Why does the moon have gravity but no air?
The moon has gravity, but it is much weaker than the gravity on Earth. It is not enough to hold onto an atmosphere.
What force hold earths atmosphere in place?
That's gravity. Near the surface air has a density of about 1.2Kg/m^3. Air isn't that lightweight as you might think. We usually just don't lift it, but push it away, which is much easier.
Why can people only breathe on Earth?
earth gravity is strong enough to hold down the atmosphere
What planet can hold 1300 earths?
Jupiter
What forces act to hold a planet in orbit around the sun?
Gravity is the force that holds a planet in orbit around the sun. Inertia keeps the planets spinning.
What inner planet or planet has enough gravity to hold on to most grasses?
Earth & Venus.
What hold the planet in orbit around the sun?
The planets orbit the Sun because of the force of gravity that keeps them there. Without gravity they would all move in straight lines.
What planet has a gravity so as to hold most gases?
Jupiter
Which planet has enough gravity to hold on to most gases?
Jupiter has the most gravity out of all the planets
Does outer space have an atmosphere?
No, it's the other way around: atmosphere needs gravity to stay on a planet. Artificially, pressurized compartments can maintain atmosphere though. Such is the case on the International Space Station.
What is the surface pressures of mars?
Mars' surface pressure is around 0.7 kPa, around 0.7% of Earths surface pressure. The planet has a smaller mass and lower surface gravity than Earth, so it can only hold a thin atmosphere.
Does mars have enough gravity to stay still?
The gravity of a planet does not hold it in place, nor does any planet stay still. The planets are in constant motion as they orbit the sun.
What characteristics determine whether a planet or moon can maintain an atmosphere?
gravity and temperature; It needs gravity so it can hold its atmosphere.
How does the gravity of the planets effect the mass?
the bigger the planet the more gravity it has because it needs to hold it self together so it has more gravity than smaller planets who require a small amount of gravity to hold themselves toghther
Which inner planet has enough gravity to hold on to most gases?
I think it is Venus or Earth.
