Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 384
350. Physically Double and Multiple Stars. — In themajority of cases the components of double and multiplestars are in reality comparatively near together, and arebound together by gravity into a physical system. Suchcombinations are called physi-cally double and multiple stars.The components of…
Astronomy
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