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A binary system is an Astronomy term referring to two objects in Space , usually Star s, which are so close that their Gravitational Force s attract one another into a mutual Orbit . Astronomers find that more than 50% of stars are binary stars. A '''multiple system''' is like a binary system but consists of three or more objects. See Binary Star for the common case of a binary system composed of two stars. BRIGHTNESS FLUCTUATION Sometimes, a binary system consists of a large dim star and a small bright one, causing fluctuations in brightness of the system. If the bright star is behind the dim one the system appears dim. If the bright star is in front of the dim one, the system has medium brightness. If the stars are next to each other, the system appears very bright. REFERENCES
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