Definition of variable star in English:

variable star

Line breaks: vari|able star

noun

Astronomy
  • A star whose brightness changes, either irregularly or regularly.
    More example sentences
    • Cepheid variable stars tend to be extra bright.
    • They'll also be searching for storms on Mars and Jupiter, monitoring active galactic nuclei, and measuring variable stars.
    • He discovered the mass-luminosity relationship for stars, he calculated the abundance of hydrogen, and he produced a theory to explain the pulsation of Cepheid variable stars.

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Word of the day coloratura
Pronunciation: ˌkɒlərəˈtjʊərə
noun
elaborate ornamentation of a vocal melody