What is the most accurate method to calculate the distance to the stars? What are the limitations of this method, and at what distance?

Accurate method to calculate the distance to the stars

What is the most accurate method to calculate the distance to the stars?

What are the limitations of this method, and at what distance?

What are some other ways to estimate stellar distances more accurately than the method identified above?

What unit of measurement is most commonly used to describe the distances between stars and/or galaxies?

How does knowing the distance help classify a star?

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