And how we use it to calculate distances from stars to the earth.Thank you
She discovered a relationship between the periods of a cepheid variable and their brightness by assuming that all of them in the Large Magelenic cloud were approximately the same distance from us. This allows us to determine the absolute amount of brightness of any cepheid in the universe just by watching it's duration. By knowing how bright the object actually is, and how bright we observe it to be, the distance is easily determinable.
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