The suns gravitational pull.
it keeps it in orbit
The force of the Sun's gravity keeps them in their orbits.
The Sun's strong gravity keeps all the planets in orbit around it.
Gravity and motion. Gravity pulls the planets in and keeps them from flying away, while the velocity of the planets keeps them from being sucked in completely.
the sun because it keeps the planets in orbit and provides heat.
It keeps the solar system together because without it we would be floating around. :)
The gravitational force between the sun and each object in the solar system
gravity
9 P in the S S = 9 Planets in the Solar System
Sun's gravitational force keeps all the planets bound to the sun
In our solar system, the sun provides heat and light to the planets; also, the gravitational attraction of the sun keeps the celestial bodies in the solar system in orbit. Without the sun, there would be no solar system.
There are nine planets in the solar system