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How does the red shift of distant galaxies indicate that the universe is expanding?

Answer 1

Hazel Asher

It is like Doppler shift of sound,

When the object is moving away the weaves

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Answer 2

Levi Acosta

The redshift of distant galaxies indicates that the universe is expanding because it is a consequence of the Doppler effect. When an object is moving away from an observer, the light waves it emits become stretched, resulting in a shift towards longer wavelengths, which appear redder. This phenomenon is known as redshift. The further away a galaxy is, the faster it appears to be moving away from us, and the greater its redshift. This observation is consistent with the idea of an expanding universe, where galaxies are moving away from each other as the space between them expands over time.

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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.