| 21. | Mu Cygni is a binary star with an optical tertiary component.
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| 22. | The fraction of binary stars in the core region is about 14 %.
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| 23. | Within the system, there are two separate systems of binary stars.
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| 24. | Hercules is also home to many double stars and binary stars.
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| 25. | It is a binary star; the secondary is of magnitude 7.4.
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| 26. | :Well Judaism said that the sun was originally a binary star.
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| 27. | The system consists of a pair of binary stars separated by 66 arcseconds.
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| 28. | This is important in predicting the motion of binary stars in general relativity.
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| 29. | 300mm telescope for observation on binary stars and photoelectric effects of variable stars.
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| 30. | There are several prominent double stars and binary stars in Cepheus.
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