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How do astronomers measure distances to galaxies?

Answer 1

They look out for a Cepheid variable star.In the galaxy.

This kind of star can be used as a standard candle because of a specific relationship between its luminosity and pulsation period. Since the relationship is known, distance can be computed.

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Answer 2

Levi Anderson

The cosmic distance ladder technique, which combines multiple methods to accurately determine distances, parallax, redshift, and standard candles (like Type Ia supernovae and Cepheid variable stars) are some of the methods used by astronomers to measure distances to galaxies.

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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.