I was thinking about how planets and other celestial bodies were formed by the collision of other smaller celestial bodies colliding and mashing together and then realized that most planets and moons are almost perfect spheres which is hard to believe that this naturally happened due to the collisions...could pressure be involved? I realize that the pressure causing this could have come from the later created atmosphere and the air pressure within but then thought that it's entirely possible that space could have much more pressure than we previously thought because we only know about the thin vacuum of spread out gases in space because of how light refracts through the lack of matter in the void. Pressure could factor in to what causes gravity because the pressure of the atmosphere relative to the earth is what pulls (or pushes in this case) mass towards it while in space there is no relative object to push an item towards so the pressure is pushing against it at the same exact pressure in every direction causing it to "float" instead of fall towards the nearest celestial body.
Pressure is defined as force divided by area; pounds/in2. The needed force, in this case, is the gravitational force.