Gravity is the force which keeps them there.
The Sun's Gravity
The planets and other objects in the solar system stay in their orbits due to the mutual gravitational attraction between each orbiting object and the Sun.
The gravity of all the planets and the alignment of them.
it is a force called gravity.
A solar system.
Kuiper Belt objects
Sirius is not part of our Solar System, so it is not appropriate to talk about "other objects in the solar system".
Scientists classify small objects in the solar system by size, shape, and composition
Objects within the solar system.
Objects within the solar system.
If the objects are in orbit around the sun then they are in the Solar System.
Our solar system consists of the sun, the planets, their moons, and a variety of smaller objects. The sun is at the center of the solar system, with other orbiting around it. The force of gravity holds the solar system together.