Gravitational force
Heavenly bodies revolve around the sun because of the gravitational pull that the sun exerts on them. This gravitational force keeps the planets and other objects in orbit around the sun, following a path determined by the balance between the object's inertia and the gravitational pull of the sun.
Gravity
Gravity.
Gravity.
Gravity.
It keeps them in orbit around the sun.
Which type of pull? This is still gravity, but now it's the Moon's gravity or "Lunar gravity".
Yes, The Sun Is always moving due to gravitational pull from heavenly bodies in the solar system.
The planets mass creates gravity which pulls it into a spherical shape. This is the difference between planets and other heavenly bodies such as moons and asteroids. To be defined as a planet, a body must have enough gravity to pull itself into a spherical shape and it's gravity must be sufficient to clear its area of other debris.
Weight is a measurement of how heavy things are under the pull of gravity. You and I have weight, and so does air, trees, dirt, and so on. The Sun is not under a noticable pull of gravity, so we say it has "Mass". Mass is the same as weight on Earth, for instance, but not for other heavenly bodies. The Sun's mass is 1.98855±0.00025)×1030 kilograms, or equal to about 333,060 Earths.
Gravity does not depend on density. Gravity is the gravitational pull that is invisible and cannot be touched or changed. Density is how much matter is packed within an object, which can be changed. Gravity and density are two totally different things, and are in no way related, therefore gravity does not depend on density.
A pull. Gravity is always attractive, so in the long run, gravity is the deciding factor in the motions of planetary bodies