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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Using artificial neutral networks, his tool allows astronomers to distinguish true binary star systems from chance alignments in massive data sets like the European Space Agency’s Gaia mission. Regina Elling, San Diego Union-Tribune, 23 Sep. 2025 The double stars of Albireo are considered a binary star system, just over 400 light-years away, with just one light-year equaling nearly 6 trillion miles. Mike Lynch, Twin Cities, 14 Sep. 2025 Antares is, in reality, a binary star system, made up of a red supergiant star with a white main sequence companion, though the light of the red giant dominates the naked-eye view from Earth. Anthony Wood, Space.com, 29 Aug. 2025 Astronomers using the James Webb Space Telescope found a planet while observing Alpha Centauri, a system of three stars orbiting each other — binary stars Alpha Centauri A and B, along with the red dwarf star Proxima Centauri. Jamie Carter, Forbes.com, 9 Aug. 2025 See All Example Sentences for binary star

Word History

First Known Use

1826, in the meaning defined above

Time Traveler
The first known use of binary star was in 1826

Browse Nearby Words

Cite this Entry

“Binary star.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/binary%20star. Accessed 29 Sep. 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

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!