gravitational force
Gravity.
The force of gravity pulls the planet towards the Sun and this is balanced by the planet's "centrifugal force" away from the Sun. (Centrifugal force is called a "fictitious force" in physics. It's a mathematical way of representing the planet's tendency to move in a straight line path. Some people prefer to talk about the planet's "inertia" rather than centrifugal force.)
Gravity.Gravity.Gravity.Gravity.
Gravity.
gravity
The gravitational force between the Earth and the Moon is what keeps the Moon in orbit around the Earth. Similarly, the gravitational force between the Earth and the Sun is responsible for the Earth's orbit around the Sun. In both cases, these gravitational attractions provide the necessary centripetal force to maintain the orbits of these celestial bodies.
A force that most affects the path of a planet around the Sun is gravity.
The gravitational force between the planet and the sun is what holds the planet in orbit around the sun. This force keeps the planet moving in a curved path around the sun, in balance with the planet's inertia.
The momentum of the planets (centrifugal force) revolving around the sun is in a constant battle with the gravity of the sun which is trying to attract it (centripetal force). The centrifugal force wants to take off into space in a straight line, but the sun keeps dragging it back. It's a battle between the centrifugal force trying to escape VS the sun's gravity. Over the last 'jillion' years or so, the planets have reached an equilibrium of the forces. SO the planet just keep revolving away.
If there were no force attracting the sun and a planet toward each other, then the planet would move at a constant speed in a straight line, and would just sail away from the sun, never to be seen again. But since there are forces of attraction between them, they're constantly being pulled together, and they wind up both revolving around their common center of mass.
Earth's Moon has no planets, unless you consider Earth to be the Moon's planet. A planet is defined as an object revolving around the Sun that is large enough to form itself into a sphere from the force of gravity, and yet not be so large as to create fusion like the Sun. It also must clear its orbit of other dust and debris. A moon, on the other hand, is an object that revolves around a planet.
gravity