Question

which term defines a star system with two stars?
binary star system
eclipse star system
open cluster star system
globular cluster star system

Explanation:

A binary star system is defined as a star system with two stars. An eclipse star system is not a standard term in astronomy for a system with two stars. An open cluster star system contains many stars (typically a few hundred to a few thousand) loosely bound together. A globular cluster star system contains a large number (tens of thousands to millions) of stars tightly bound in a spherical shape.

Answer:

binary star system