Gravity.
It's the weakest of the 4 fundamental forces in our universe, but still the force responsible for holding it together.
String theorists suggests explains that gravity leaks down from a stronger force in higher dimensions.
gravity
Gravity
Gravity, inertia, and gravitational force.
The question probably means "What keeps the planets in orbit around the Sun?" The answer to that is : The Sun's gravitational attraction provides the force needed to keep the planets in orbit. This force doesn't pull the planets any closer to the Sun, but it stops the planets moving away (at a tangent to their orbits) due to their own velocities.
Gravity keeps the planets together
The gravitational force exerted by the Sun keeps all the planets in their orbits. This force balances the planets' tendency to move in a straight line and keeps them moving in elliptical orbits around the Sun.
The planets are kept in orbit around the sun due to the gravitational force between them. This force, which is a balance between the planet's inertia and the sun's gravitational pull, keeps the planets moving in a stable path around the sun.
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Gravity.
Gravity
Answer:because the sun is like a big ball of mass which means that the planets pull the mass from the sun which keeps the planets in their rotation but if there was not mass then all the planets would go on a straight line.
The gravity of there star keeps them on path and a planets moon is sun around by its planets gravitational force