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How does red shift relate to the universe?

Answer 1

Quasar is a point source of radiation, beyond Milky Way. Redshift is an effect of nature/s expansion of space, in between the Earth and a quasar..

Perhaps the (quasi-stellar) light comes from a distant Black Hole.

It appears to be a point source of light in a far-off galaxy.

When light or other electromagnetic radiation is present, redshift occurs.

increases in wave length or shifted to the from a far-off object

red end of the spectrum; longer wave lengths are indicated by redder colors.

phenomenon is comparable to what occurs when the source of light is

moved out of our way.

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Answer 2

Luke Allen

Redshift, related to the universe through the Doppler effect, is the phenomenon where light from far-off objects appears to have longer wavelengths, shifting towards the red end of the spectrum, suggesting that galaxies are moving apart and that the universe is expanding.

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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.