The force of gravity causes orbits.
Gravity and inertia. Inertia keeps the planets moving while the gravity of the sun keeps the planets drawn to orbit in ellipses.
Gravity
Gravity and velocity (inertia) keeps planets in orbit around suns.
My balls. They lay a nuclear active radiated gas that explains the whole theory.
The mutual, equal forces of gravitation between every pair of masses provide the centripetal force that maintains closed orbits.
gravity
The force you seek is gravity.
The force of the Sun's gravity keeps them in their orbits.
The gravity of the Sun keeps the planets in their orbits. They stay in their orbits because there is no other force in the Solar System which can stop them.
Centripetal force and Gravity
Gravity is what keeps the planets going in their orbits. If gravity just stopped, then the planets would go flying in a straight line tangent to their orbit.
Gravity and inertia. Inertia keeps the planets moving while the gravity of the sun keeps the planets drawn to orbit in ellipses.
Gravity
Gravity and velocity (inertia) keeps planets in orbit around suns.
It isn't actually a who, but a what. That what is Gravity.
The force of gravity keeps the planets in their orbits, and without it they would all go off in straight lines into interstellar space.
The gravitational pull of the sun keeps the planets in orbits... Although some people think it is magnetism....