Gravity
The question probably means "What keeps the planets in orbit around the Sun?" The answer to that is : The Sun's gravitational attraction provides the force needed to keep the planets in orbit. This force doesn't pull the planets any closer to the Sun, but it stops the planets moving away (at a tangent to their orbits) due to their own velocities.
The Gravitational Pull
the force that tends to make a moving bodies fly away to the center of rotation
The Sun... from the Sun? If you mean, what stops the Sun from breaking apart, it is held together by its own gravity.
If the force of gravity suddenly stopped acting on the planets, they would continue moving in a straight line at a constant speed, following Newton's first law of motion. Without the force of gravity to pull them towards the Sun, the planets would travel in a tangential direction away from their current orbital paths.
The force that tends to make moving bodies fly away from the center of rotation is called centrifugal force. It is a pseudo-force experienced by objects in a rotating reference frame that appears to push objects outward from the center of rotation.
Actually, gravity is the force that would cause planets to fall into the sun. It is centripetal force that keeps the planets revolving and not falling. Centripetal force would cause the planet to fly off into space, while gravity would cause planets to be pulled into the sun. It is the balance of these two forces that keep planets in their orbits. ____________________________________ Newton's 2nd Law states that a body in motion, tends to remain in motion with a uniform velocity. That means that unless there is some sort of outside force, an object will continue to move in a straight line at a constant speed. Gravity is the "outside force" than bends the moving object away from its straight path into an orbit. Orbits are a balance between the attractive force of gravity and the momentum of a moving body. It's a delicate balance; if the object (be it moon, satellite or planet) is moving too fast, it will fly out into space, and if it is moving too slowly it will fall in toward the primary body.
The Sun's gravity is trying to pull the planets towards it. But the planets have their own velocities and all the Sun's gravitational attraction is needed to stop the planets moving away from the Sun. The result is that the planets orbit the Sun.
Centrifugal force is a force that pushes objects in motion away from the center of rotation. It results from the inertia of an object moving in a curved path.
There are TWO forces that keeps objects in orbit; gravity and inertia. Everything is in motion. The force of inertia, the momentum that an object has BECAUSE it is moving, KEEPS the object moving - at a constant speed and in the same direction. But if inertia alone ruled, all of the planets would fly out away from the Sun. Another force must tie things together, and that is gravity. Gravity ties every mass to every other mass, pulling them together with a force that is proportional to their masses - but which decreases proportionally to the SQUARE of the distance between them.
The force of the Sun's gravity keeps them in their orbits.
You have to blow on him hard when he stops moving stop blowing and then blow again fast or he will get away.