How do you calculate the distance of a galaxy?
Josiah AdamsVariable stars like Cepheids follows a relation known as period/luminosity ratio.
The brightness of stars decreases approximately proportionately to distance, so if we can locate a variable star, we can use it as a standard candle to measure distances.
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John AlexanderThe cosmic distance ladder is a popular method for calculating galaxy distances. It uses Hubble's law to measure redshift for distant galaxies and parallax for nearby galaxies, Cepheid variable stars and supernovae as standard candles for intermediate distances.
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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.
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.
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.
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.
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