Question

Which force is responsible for holding the solar system together?

Answer 1

The force which is responsible for holding the solar system together, is too weak to be observed due to the very long distance of separation in most of the cases. And also it is a force that attracts any two objects with masses such as heavenly bodies also.

Complete answer:
Gravitational force of planets in the solar system is responsible for holding the solar system together.
The atmosphere is held above the earth by the gravitational attraction of the planet. The earth's gravitational force also keeps us firmly planted on the ground. Various items are only attracted to each other by gravity.
Force is required to induce motion in a body, as we all know. When an object falls from a great height to the ground, a force must be operating on it. This force is caused by the gravitational pull between the earth and the item, which is known as the Earth's Gravitational Force or gravity. Similarly, the earth's gravity causes a leaf to fall off a tree. The earth, in fact, attracts or pulls all objects to its centre.
The earth's gravitational pull is responsible for keeping the atmosphere above the surface, for rain falling on the surface, and for the flow of water in rivers. It is also the earth's gravitational force that keeps us securely planted on the ground. Despite the fact that the numerous objects on this planet are continually attracted to one another, they do not move since the gravitational force of attraction between them is so modest. When two bodies or objects are exceedingly huge and have large masses, the gravitational attraction between them is quite strong. The sun, the moon, and the earth, for example, have enormously huge masses, therefore the gravitational pull between the sun and the earth, other planets, or the earth and the moon is enormous.

Note:
The sun is the solar system's biggest body. It holds more than $99\%$ of the solar system's mass. With its dominant mass, the sun exerts the largest gravitational force in the solar system, holding all other objects in orbit and controlling their motion. Ellipses are the pathways or orbits that the planets take around the sun.