What two main components are in constant negotiation to maintain a stable planetary orbit?

Answer

Gravity pulling inward and forward momentum (inertia) pushing outward

Orbits are maintained by the ongoing negotiation between the Sun's gravity constantly pulling the planet inward and the planet’s own inertia (forward momentum) trying to carry it off in a straight line.

What two main components are in constant negotiation to maintain a stable planetary orbit?
Earthforcegravityplanetsolar system