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.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)
