How does astronomer calculate distance of star?

Comparing apparent brightness of star to true brightness

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Comparing true brightness of star to apparent brightness

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Comparing true brightness of star to true brightness

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Solution

The correct option is C Comparing apparent brightness of star to true brightness
The brightness of the stars changes over time. The difference in the brightness (difference in the apparent brightness to the true brightness) over the time allows calculating the distance to the star. This is the cepheid variable stars method that is used to measure the distance to stars beyond 100 light years.
Comparing the apparent brightness of the star to true brightness

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