Suppose we observe a Cepheid variable in a distant galaxy that brightens and dims with a regular period of about 10 days. What can we learn from this observation?

Answer 1

The period of a variable and its luminosity have relation.

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Answer 2

When a Cepheid variable with a regular period of about 10 days is observed in a distant galaxy, its luminosity can be inferred, and its distance from Earth can be accurately measured by using the period-luminosity relationship established for Cepheid variables, and comparing its observed brightness with its known intrinsic luminosity.

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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.

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.

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.

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.

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