Quite simply gravity and momentum.
See related questions.
The force you seek is gravity.
centripetal force.
The gravitational force exerted by the Sun keeps all the planets in their orbits. This force balances the planets' tendency to move in a straight line and keeps them moving in elliptical orbits around the Sun.
The main force that keeps planets in orbit around the Sun is gravity. The gravitational pull from the Sun keeps the planets moving in their elliptical paths. This force of gravity is what maintains the balance needed for a planet to stay in orbit.
The force that keeps all of our planets in rotation is gravity.
The planets are kept in orbit around the sun due to the gravitational force between them. This force, which is a balance between the planet's inertia and the sun's gravitational pull, keeps the planets moving in a stable path around the sun.
Actually, it's the gravity of the sun that keeps the planets in orbit around it. The force of gravity between the sun and the planets causes them to be pulled towards the sun, while their momentum keeps them moving in a circular or elliptical path.
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 force of gravity.
The gravitational force produced by the sun keeps the planets in orbit around it. This force pulls the planets toward the sun, creating a continuous circular motion rather than a straight line out into space.
The gravity of there star keeps them on path and a planets moon is sun around by its planets gravitational force
Gravity is the force that keeps planets and moons in orbit. The gravitational pull between the planet or moon and the object they are orbiting around, typically a star like the sun, is what keeps them moving in a stable path. This balance between the gravitational force and the object's inertia causes them to continuously orbit in a closed path.