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binary star
noun
: a system of two stars that revolve around each other under their mutual gravitation
Examples of binary star in a Sentence
Recent Examples on the Web
In mid-December 2024, scientists discovered a pair of binary stars designated D9 orbiting each other close to Sagittarius A* (Sgr A*), the supermassive black hole at the heart of the Milky Way.
—Robert Lea, Space.com, 30 Dec. 2024
Scientists have never been able to detect the binary star system within the S-cluster -- until now.
—Julia Jacobo, ABC News, 17 Dec. 2024
As Parker pointed out, many stars are born with a binary partner from the same cloud and become binary stars.
—Robert Lea, Space.com, 24 Dec. 2024
Some scientists speculate that these objects may be the remnants of previous binary star mergers, suggesting that D9 could offer a glimpse into their origin.
—Dan Perry, Newsweek, 18 Dec. 2024
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Word History
First Known Use
1826, in the meaning defined above
Dictionary Entries Near binary star
Cite this Entry
“Binary star.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/binary%20star. Accessed 5 Jan. 2025.
Kids Definition
binary star
noun
: a system of two stars that revolve around each other under the gravitation of both
More from Merriam-Webster on binary star
Thesaurus: All synonyms and antonyms for binary star
Britannica.com: Encyclopedia article about binary star
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