maybe the gravitational pull... from the other planets?
The balance between the inertia of the Moon and the gravitational pull keeps the moon in orbit with Earth.
When it an object in space in moving it will keep moving at the same speed with the property of inertia. Then moon is an object that has inertia. Gravity keeps the moon from going off into outer space but inertia keeps the moon from crashing into the moon. Gravity and inertia have to be balanced in order for an object to remain in orbit.
Inertia
The attraction of gravity between the Earth and the Moon.
The Earth's gravity keeps the moon in orbit.
The earth is six times more massive than the moon. That keeps the moon in orbit around it, just as the mass of the sun keeps the earth in orbit around it.
it keeps it in orbet
gravity
The same thing that keeps you from floating out into space. Gravity.
The Earth's gravitation.
That's the mutual force of gravitation (gravity) between the Earth and the Moon. This, combined with the Moon's velocity (its inertia), results in the orbital path that the Moon follows.
The moon is falling, but since the Earth's gravitational pull is constantly acting on it, the moon keeps falling but it is moving towards the Earth so it move in an egg shaped motion.