Well, air pressure I would say

[perpetual motion]

Listen up people, this is my idea of this so called gravity thingy.
But firstly,I'am really disappointed in every thing that I have read regarding this
issue. I can not believe how brainwashed the people are on this subject.Really!
There is not the word gravity In my vocabulary.
This subject is right in front of our noses and it has been here since the magneto-
sphere came about.Well, maybe a little latter on.
I am talking about Air Pressure,that no one seems to talk about.
Yes air pressure and a lot of it.You see it is the magnetosphere squeezing the
atmosphere around this planet that makes things stay on the ground. And that
probably goes for all the other rocks floating around the sun. All of the rocks out there
have a magnetosphere of some kind around them with gases enveloped within them
The less percentage of gases the less the pressure there is on the surface.
If our air pressure went kaput, this planet would look like Mars.
It is the pressure of the squeezing of the magnetosphere that keeps things on the ground.
And you all know that these magnetospheres are caused by plasma.
Well I would also say that giant magnets are in play with this.
Air Pressure!

[crawler]

So, air pressure causes gravity.
And gravity then causes air pressure.
Mystery solved.

[nick c]

Venus has an atmospheric pressure at its surface of 1350 psi (92 Bar) as opposed to Earth which is 14.7 psi (1 Bar at sea level) and has 91 % of Earth's gravity.
So Venus has 92 X greater atmospheric pressure and has only 0.91 X the gravity.

Mars has a surface atmospheric pressure of 0.095 psi (0.006 Bar) which is less than 1% the atmospheric pressure on Earth. Yet Mars' gravity is about 38% that of Earth.

Mercury's atmospheric pressure is 10 (to the -12 power) Bar, which means that Mercury's atmospheric pressure is so low that it can be considered zero for the purpose of this discussion. Mercury's gravity at the surface is 38% of Earth.

So, a comparison of the four terrestrial planets shows no correlation between atmospheric pressure and gravity. And though I am not going to list each case, I am sure that a lack of a correlation could be found when one examines the gas giants and each of their terrestrial type moons, as well as the Earth's Moon.

Of course, the more gravity that a celestial body possesses, the better its ability to retain a denser atmosphere, but, the atmospheric pressure is largely a result of gravity rather than an explanation.

[perpetual motion]

Well,I would have expected as much.
But I will give myself 5 points to sciences 0.
I haven't seen are heard of NASA having a barometer on any mission
let alone a thermometer.
Then your saying that gravity holds down the molecules around a
rocky body in space. Forget everything that you have read or heard
and think for oneself logically. If one is heavier than air then you are going to fall
flat on ones face. The magnetosphere is what is holding down the molecules
of air and gases.
The magnetosphere tops out around some 30000 miles up, once you get that high you
can float around all you like without falling. That is the strength of these
magnetospheres, around earth that is.

[Maol]

Do you think the magnetosphere pulls on the magnetite in your brain and holds you upright so your feet are on the ground and your head is in the clouds while the air pushers from all around to keep you able to stand? (unless you are laying down, in which case the air holds you flat)

[perpetual motion]

Well I would say no,no and no.
Air pressure at sea level 14.7lbs sq in.Where I live it is 9.54lbs.
Humans that are born of this planet are somewhat immune to this
pressure so that we can stand upright. Heavier than air objects
will fall, lighter than air will float up. Science someday will
realize that this is true. The magnetosphere holds this atmosphere
tight around this planet. No gravity required!!