How do Cepheid variables assist astronomers in measuring distance?
Answer
They act as standard candles with luminosity tied to pulsation periods
Cepheid variables are specific types of stars that serve as standard candles for astronomical distance measurements. Because their luminosity is directly linked to their pulsation period, scientists can determine exactly how bright the star is intrinsically. By comparing this known intrinsic brightness to how dim the star appears from Earth, researchers can accurately calculate the distance to the galaxy in which the star resides, providing a highly reliable ruler for the cosmos.
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