Once an object enters orbit, what keeps the object moving sideways?
a. inertiab) gravityc) centripetal forced) air resistance

Answer;

Inertia

Explanation;The first Newton's law of motion well know as the law of inertia indicates that a body or an object will remain in its state of rest or constant motion until acted on by an external force, that will displace the object from its rest potion or deviate from its constant motion. Force of inertia is the force that resist the change in velocity of motion of an object. This force is normally equal and opposite to the force applied to the object. In a circular path the force of inertia keeps the object or the body from moving sideways.