| 21. | This visual binary system has a period of 49.6 years.
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| 22. | A binary system of one or two marks are combined.
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| 23. | :This is interesting because Luyten 726-8 is a binary system.
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| 24. | About 5 % of all known neutron stars are members of a binary system.
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| 25. | The binary system lies 11, 000 parsecs away in Aquila.
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| 26. | Confirmation would indicate that this is a close binary system.
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| 27. | This may indicate that this is a binary system with an unresolved secondary component.
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| 28. | Tatooine is located in a binary system, with two suns.
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| 29. | The binary system lies 10, 000 light-years away in Orion.
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| 30. | The binary system has an orbital period of 15.8 days.
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