Suppose We Observe a Cepheid Variable in a Distant Galaxy

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

A) It will allow us to determine the mass of the galaxy.
B) Under the rules of the International Astronomical Union, we will be entitled to naming rights for the galaxy.
C) It will allow us to calculate the rotation rate of the galaxy.
D) We can learn the distance to the galaxy.

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