How Many Stars Can A Planet Have?

we will talk about multiple star systems.
A multiple star system is a group of two or more gravitationally bound stars.
Let’s start with the simplest type: the double star system, also designated as a double star, physical double star or binary system, in which the two components orbit around the common center of mass. If the two stars have a similar mass, to an external observer who observes them from a certain distance, the two stars will seem to orbit each other.

If, on the other hand, the two stars have very different masses, the less massive star will seem to orbit around the more massive one, because the common center of mass falls within the latter. If there are no tidal effects, no perturbation from other forces, and no mass transfer from one star to another, a binary system is stable and both stars trace an elliptical orbit around the center of gravity of the system indefinitely.

If, on the other hand, the components of a binary system are close enough (narrow binaries), they can reciprocally distort their atmospheres and, in some cases, they can even exchange material so as to modify their normal evolution.

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