Yes they are the sun has gravity that holds the planets in place.
Not all of the planets are held by gravity.
Most people don't think this but planets are actually held in orbit by gravity. With out gravity the planets will fall down.
Any moon is held in orbit by gravity, just as the planets are held in orbit around the sun by gravity.
The planets are held in orbit by the gravity of the Sun, and also because that is what happens when the force of inertia and gravity are combined.
Planets move away by gravity not holding it together and also gravity holds planets together
Gravity keeps the planets together
Yes it does
No. The outer planets do not have solid surfaces. Those planets are made of gases held together by gravity.
because gravity and inertia are kinda of playing a game of tug a war but both sides are equal so they do not move
gravity
By gravity
The gas of the gas planets is kept in place by gravity.