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WordReference Random House Unabridged Dictionary of American English © 2024bi′nary star′, [Astron.]- Aerospace, Astronomya system of two stars that revolve about their common center of mass. Also called binary, binary system.
Collins Concise English Dictionary © HarperCollins Publishers:: binary star n - a double star system comprising two stars orbiting around their common centre of mass. A visual binary can be seen through a telescope. A spectroscopic binary can only be observed by the spectroscopic Doppler shift as each star moves towards or away from the earth
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