How would you explain universe expansion and its relation to red shift?

Due to the doppler effect, Hubble found that almost all objects in the universe show a red shift in the frequency of light waves.

A blue shift occurs when an object approaches an observer because light waves are compressed and brought closer together.

Red is the longer wave length, so objects moving away from an observer are perceived as moving to the red part of the spectrum. As the light waves are stretched and spread farther apart, moving objects exhibit a red shift.

The idea of an expanding universe destroyed the world view of a steady state universe that had always existed. Hubble's discovery of the red shift doppler effect altered scientists' perceptions of the universe. The red shift doppler effect is strong evidence that the universe is expanding from a point of origin.

The theory of the universe's expansion is based on observations of redshift, which is the phenomenon where light from far-off galaxies appears shifted towards the red end of the spectrum. This is because, as galaxies move away from us, the light they emit gets stretched, causing its wavelength to increase and thereby shifting it towards the red end of the spectrum. The more distant a galaxy is from us, the greater its redshift tends to be, indicating that it is moving away from us at a faster rate.