| 11. | Even when designers used a binary system, they still had many odd ideas.
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| 12. | SS Cyg, like all other cataclysmic variables, consists of a close binary system.
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| 13. | It is a binary system in which a star orbits the black hole.
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| 14. | HD 41004 is a complex binary system about 139 light-years distant.
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| 15. | The HU Aquarii binary system exhibits variations in the timing of the eclipses.
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| 16. | Component stars of Algol binary systems have a spherical, or slightly ellipsoidal shape.
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| 17. | They may simply be binary systems whose components eclipse each other.
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| 18. | Binary systems form a relatively small fraction of the total population of runaway stars.
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| 19. | Is a binary system with an orbital period of hours.
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| 20. | Such long strings are quite common in the binary system.
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