In a binary star system, each star orbits around what point?

In a binary star system, each star orbits around the center of mass of the system. This is an important concept in celestial mechanics. The center of mass is the point where the mass of the system can be thought of as being concentrated for the purpose of analyzing motion. In a binary system, both stars exert gravitational forces on one another, and they both orbit this common center of mass.

If one star is more massive than the other, the center of mass will be closer to the more massive star. However, both stars will still be in orbital motion around this point. The characteristic motion, where each star follows an elliptical path around the center of mass, reflects the gravitational interactions between them. The center of mass provides a balanced point that helps in simplifying the dynamics of their orbits.

Understanding this concept is crucial for studying binary systems, as it lays the foundation for understanding their behavior, orbital dynamics, and the effects of their masses on their separation and speed. The other options mention irrelevant points such as the center of the galaxy, which applies to the galaxy's structure rather than the binary stars specifically, and the closest or farthest star, which do not describe the shared gravitational relationship in terms of a center of mass.