All the planets are moving in circular orbits. What provides the necessary force for this motion and what is the direction of this force? What will happen if this force disappears suddenly?

(N/A) $1$. The gravitational force exerted by the Sun on the planets provides the necessary centripetal force for their motion along a circular orbit.
$2$. The direction of this force is always towards the center of the orbit (i.e.,towards the Sun).
$3$. If this force were to disappear suddenly,the planet would no longer be able to maintain its circular path and would continue to move in a straight line along the tangent to its orbit at that point,as per Newton's first law of motion.