Mass. There's a gravitational force of mutual attraction between every pair of
mass objects. The mutual force of attraction between the sun and every orbiting
object in the solar system is what keeps each one in its orbit.
A solar system.
If the objects are in orbit around the sun then they are in the Solar System.
solar system
The orbit
The sun
The Solar System!!
The Sun's Gravity
The Solar System!!
Most of the mass of the solar system is in the sun. As a consequence all objects in the solar system orbit the sun.
The term used for the sun and the objects that move around it is solar stem. This is what contains the other planets.
They are all in orbit.
The Solar System.