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How does redshift change the universe?

Answer 1

Redshift is an observation of a relativistic effect in the universe. It is a result, not a causative factor.

When light and sound are components of a moving object (planes, planets, trains, etc.), they both exhibit doppler shifts: the incoming perspective is compressed, or "blue shift," and the outgoing (receding) perspective is expanded, or "red shift." A "Doppler shift" is a more general term for the phenomenon of a wavelength shift caused by external forces.

The shift of light frequencies to the longer "red" wavelengths is called a "red shift." While other electromagnetic wavelengths will show similar shifts, they won't necessarily get "redder,"

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Answer 2

Ian Aitchison

In cosmology, redshift is the result of the universe's expansion, which causes light to shift towards longer wavelengths. It provides evidence for the universe's expansion by showing that distant objects are moving away.

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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.