What Is Stable Orbit?

Things can be in stable orbits right? It's like asking the question, why doesn't the earth get sucked into the sun? For the same reason, it has the right velocity and the right direction to be in a stable orbit. So if you had two stars in a system, you'ud have the two stars cirtay each other forever, kind of, right? They could be stably circling their common centre of mass. And then probably there are other things in the solar system, and they're orbiting that as well.