Gravity
Gravity is the force that brings all things together.
The gravity, between the Sun and the planets.
If you was a general answer, all of them. However if you want a technical answer, none of them, being that all objects, including the sun, orbit the center of mass of the solar system.
Gravity from the sun keeps the planets in the solar system.
Gravitational force.
Everything has a center of gravity, and a gravitational pull. For example, what keeps Earth from floating off into space? Answer: The Sun. The sun is what we're orbiting because it has a massive gravitational pull at it's center pulling our smaller planets towards it.
The gravity from the sun attracts the planets, vs the speed of the planets keeping them from falling into the sun.
I believe earth is traveling about 2,000 miles an hour.
It's all about SPEED, MASS, GRAVITY and maintaining an equilibrium.
The planets want to go straight out into the void, but the pull of the sun keeps it curving around the sun.
The mass of the sun is much greater than it's planets, so everything with mass will be drawn to the gravity pull of our Sun.
So, it's the particular speed of the planets that maintain the orbit, and keep them from flying out into space, or from sinking into the Sun.
This is relatively stable, although all planets also effect each other, changing slightly the path of their orbits.
so also: http://en.wikipedia.org/wiki/Orbit
Sun's gravitational force keeps all the planets bound to the sun
The planet's strong force of gravity holds the atmosphere down and stops it escaping. Atmospheric gases have masses, and the Earth's atmosphere has a mass of about 1.2 kg per cubic metre.
Gravity.
Centripetal Force.That force is, of course, supplied by gravitional force.
Gravity
The force of the Sun's gravity keeps them in their orbits.
Sun's gravitational force keeps all the planets bound to the sun
The force that keeps all of our planets in rotation is gravity.
The planet's strong force of gravity holds the atmosphere down and stops it escaping. Atmospheric gases have masses, and the Earth's atmosphere has a mass of about 1.2 kg per cubic metre.
gravity
The force of gravity.
The gravity of the Sun keeps the planets in their orbits. They stay in their orbits because there is no other force in the Solar System which can stop them.
The gravity of there star keeps them on path and a planets moon is sun around by its planets gravitational force
Planets orbit the sun because gravity keeps them from escaping, and momentum keeps them moving forward. The orbits are elliptical, which is like an oval.
nothing
gravity
Gravity