Gravitational forces as described by Newton's Universal Law of Gravitation.
Also important is the inertia of the planets and Newton's First Law of Motion is involved there.
The two forces that work together to keep the planets in orbit around the sun are gravity and inertia.
They are natural satellites of the sun. A satellite an object that orbits another object , for a example the moon would be a natural satellite to earth. That is why planets are satellites, they orbit the sun.
The Sun has a powerful gravitational pull. This, combined with the velocities of the planets, keeps the planets in orbit.
Planets, asteroids, meteors, comets, moons (which are also in orbit around their respective planets), dust particles, interplanetary gas.
the suns gravity keeps the planets in orbit
It keeps them in orbit.
The Sun's strong gravity keeps all the planets in orbit around it.
The force of gravity keeps the Earth (and all the other planets) orbiting the Sun.
gravity
The planets orbit the Sun. The Sun is at the center of our solar system and does not move.
the gravitational pull from the sun keeps the planets and other small things in the orbit of the sun.(;
As the planets orbit the sun, its gravity keeps them from colliding