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How would you measure the speed at which a galaxy is traveling?

Answer 1

Galaxies are receding from one another at the rate 72 km/sec/mega parsec. This is astronomer Edwin Powell Hubble's empirical formula..

The expansion of the universe is also measured by this Hubble's constant: 1 parsec = 3.26 light years, i light years = 206264.8 AU = 3.085677 E+13 km, nearly

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Answer 2

Josiah Adams

The Doppler effect, which measures the redshift or blueshift of light emitted by stars within a galaxy, can be used to calculate the speed at which a galaxy is moving.

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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.