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- Dictionarybinary star
noun
- 1. a system of two stars in which one star revolves round the other or both revolve round a common centre.
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noun
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A binary star or binary star system is a system of two stars that are gravitationally bound to and in orbit around each other. Binary stars in the night sky that are seen as a single object to the naked eye are often resolved using a telescope as separate stars, in which case they are called visual binaries. Many visual binaries have long orbital periods of several centuries or millennia and there... Wikipedia