How do we know how fast galaxies are moving away from

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Unformatted text preview: s are moving away from us? We can measure galactic velocities by measuring the redshift of their light, which is how much the light has shifted towards the red end of the light spectrum (similar to the Doppler shift that affects sound waves emanating from a moving source). Another way we can learn about the Big Bang and the birth of the universe: by measuring the Cosmic Microwave Background. The first observation of the cosmic microwave background was accidental......
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