Standard Candles is the property of cepheid variable stars is measured that serves as a standard candle which is used to determine the stars' luminosity and thus its distance.
Good reference candles are cepheid variable stars. The brightest Cepheids are 40,000 times more brilliant than the Sun, therefore they can be viewed from a great distance due to their extreme luminosity.
Period of variability
A Cepheid's fluctuation period correlates closely with its luminosity, as Henrietta Swan Levitt observed. The Cepheid becomes increasingly bright as the variability period lengthens.
Stars that seem to pulse at regular intervals are known as cepheid variable stars. The star dims and cools as it enlarges, and gets hotter and brighter as it contracts. It can take up to 100 days for this cycle of expansion and contraction.
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