Gravity
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.
Planets in our solar system are kept in orbit by the gravitational pull of the sun. The balance between the centrifugal force of the planet's movement and the gravitational force of the sun keeps them in a stable orbit.
Gravity.
It was Isaac Newton who figured out that the force of gravity keeps planets in orbit around the sun.
Gravity is the force that keeps us grounded on Earth and planets in orbit around the sun. Gravity is a pulling force that attracts objects with mass towards each other. In the case of planets orbiting the sun, the gravitational force from the sun keeps them in their respective orbits.
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 attraction by the Sun.
The Sun has a powerful gravitational pull. This, combined with the velocities of the planets, keeps the planets in orbit.
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.
Planets are held in their orbits around the Sun by gravity. The gravitational pull from the Sun keeps the planets moving in their elliptical paths. This balance between the planet's velocity and the gravitational force from the Sun keeps them in a stable orbit.
The suns huge gravitational force keeps the planets in an orbit around it.
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.