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 neoteny
Pronunciation: niːˈɒt(ə)ni
noun
retention of juvenile features in the adult animal