Commonly: carbon dioxide and water vapor, and
less common methane, ammonia, and a few others.
Methane is released from the guts of cattle and other ungulates. Methane also leaks from the equipment at natural gas well and pipelines.
Ammonia is released by bacteria and other microorganisms in the soil, especially in soils such as in pastures where animals pee on the ground, as they must.
the earths gravitational pull towards the centre
Gravity
Although, yes, there are constantly gas molecules escaping into space from the upper atmosphere, this is happening very slowly.
Well in easy words Gravitational Force keep the atmosphere not going away from earth.
The gravitational attraction of the Earth prevents our atmosphere from drifting off into space.
The earth's gravitational force
I think that it is the ozone layer.
The earth gravity
The answer is simply gravity.
The Earth has an atmosphere because it has the gravity necessary to keep the gases from floating off into space. The more mass a planet has, the more gravity it has, and the more gravity it has, the thicker an atmosphere it can sustain.
The safest way is to put it in an open space away from people and let it harmlessly boil off into the atmosphere which is 79% nitrogen anyway.
Friction . The space craft is moving at several thousands of miles per hour (extremely fast) . At this speed it meets up with the gas particles of the upper atmosphere, hence friction. As an anology, if you throw a spinning flat stone parallel to the surface of water it will bounce off the water. If that angle is too big that stone will plunge into the water causing a splash (friction). So space capsules have to strike the upper atmosphere at just the correct angle, because '1' they may bounce off into space and never return, or '2' plunge so sharply into the atmosphere that they 'burn' up. So the angle of re-entry has to be 'just right' to stop either 'bouncing off' or creating a 'big splash'. Thereby minimising friction.
Sure can. If that little sucker comes in at the wrong angle and at the wrong speed it will bounce right off that there atmosphere.
gravity.
Well, to tell the truth, everything inside a galaxy is actually flying off in space. Everything that is anything is flying off in space. Space is the thing that everything is in. What does tend to keep things together is gravity. So as things inside a galaxy are flying around in space, gravity keeps them from flying off in their own direction.
The sun's gravity keeps them in orbit and prevents them from flying off into space. The planets travel quickly enough that they do not fall into the sun.
Gravity.
The force of Gravity.
gravity
The gravitational attraction of the Earth keeps the atmosphere from floating off into space
gravity gravity
With out gravity planets would go flying off into space
Earth's gravity. It pulls it close enough to not go flying into space, but it isn't strong enough to pull it to Earth's surface itself.
The answer is simply gravity.
The Earth would start flying off into space.