: a star whose brightness changes usually in more or less regular periods
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Mroz counters, however, that none of those cases are actual microlensing events and instead the mere fluctuations of ordinary variable stars.—Jonathan O'Callaghan, Scientific American, 4 June 2026 For really distant stars, Cepheid variable stars are used.—Mike Lynch, Twin Cities, 24 May 2026 Observations based on nearby cosmic objects like Cepheid variable stars and supernovae suggest a faster expansion rate.—Georgina Jedikovska, Interesting Engineering, 5 Mar. 2026 Bradley Schaefer, an astronomer at Louisiana State University, focuses on cataclysmic variable stars, objects that vary in brightness over time due to some type of major turmoil.—Liz Kruesi, Quanta Magazine, 2 Feb. 2026 See All Example Sentences for variable star