How can cepheid variables be used to find distance?

Answer 1

The Cepheid variables have a property. relation between its pulsation and its luminosity.

Because the relationship between light intensity and distance is well-established, these stars can serve as standard candles for calculating distances between stars.

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Answer 2

Levi Anderson

By measuring the period of a Cepheid variable's brightness fluctuations, astronomers can determine its intrinsic luminosity, which they can then compare to its apparent brightness as observed from Earth. This comparison enables astronomers to calculate the distance to the Cepheid variable and, by extension, to other celestial objects within the same region. Cepheid variables have a relationship with luminosity that makes it possible to find distance.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.