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What does red shift mean?

Answer 1

Nova Adams

A red shift is the spectrum of the star moving away from the Earth.

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Answer 2

Hailey Alexander

Redshift refers to the phenomenon where the light from an object appears to be shifted towards longer wavelengths, or towards the red end of the spectrum, as it moves away from an observer. This effect occurs due to the Doppler effect in the context of the expanding universe, where objects moving away from us exhibit a redshift in their spectral lines.

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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.