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1911 Encyclopædia Britannica/Binary System

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17624761911 Encyclopædia Britannica, Volume 3 — Binary System

BINARY SYSTEM, in astronomy, a system composed of two stars revolving around each other under the influence of their mutual attraction. A distinction was formerly made between double stars of which the components were in revolution around each other, and those in which no relative motion was observed; but it is now considered that all double stars must really be binary systems.