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Astronomy / Star types / Exoplanetology / Astrometry / Binary star / Star / Cosmic distance ladder / Luminosity / Variable star / Visual binary


Two stars rotating around their center of mass form a binary star system. Almost half of the stars in our galaxy are binary star systems. It is not easy to realize the binary nature of most of these star systems from Ear
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Document Date: 2009-10-29 21:21:41


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