One of the mysteries of the English language finally explained.
A star whose brightness changes, either irregularly or regularly.
- ‘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.’
- ‘This type of system is called an eclipsing binary, or an eclipsing variable star.’
- ‘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.’
- ‘The study of variable stars, or just variables, as they are known - is extremely important for understanding the stellar life-cycle.’
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