The commonly accepted explanation is that they move away from us. The redshift in this case is caused by the Doppler effect.
Answer2
During red shift, the Galaxies are in continuity, experiencing a centrifugal force that balances a center seeking centripetal force. The red shift is not an indicator of the galaxies moving away from us.
The red shift is mis-understood. Edwin Hubble believed that the red shift is a "hitherto unrecognized principle of nature". The red shift is a centripetal force factor, similar to the Fine Structure constant, associated with the Potential Energy.
The Earth has a red shift = v/c= .0001 indicating that the earth is attracted to the orbit center. The angle off attraction is cos A= .0001 gives the angle 89 degrees 59 ' 39". This angle is the angle between the radius and te earth's velocity vector. The red shift is derived from the "Dark Energy" of the earth, mcV.
Red shift is the cosine of the centrifugal force derived from the Divergence of the vector energy (Dark Energy), - mcDEl.V= - mcv/r cosV.
More could be said, but the galaxies are in continuity balance during red shift.
When galaxies move away from us, the waves of light stretch out- ie, they become redder. The greater the red shift, the faster the galaxies are moving away from us.
Red shift indicates that other galaxies are moving away from us, implying that the universe is expanding. This phenomenon is a key piece of evidence supporting the Big Bang theory. The amount of red shift is used to determine the distance and speed at which other galaxies are moving relative to us.
Generally, the galaxies that are further away will have the larger red shifts.
Galaxies that are moving away from the sun are red shifted, that is the light from them looks more red to us that it is when it is emitted. This is due to the speed of the galaxy moving away from which in effect stretches out the wavelengths of the light. Red shift is not the method by which galaxies move away from the sun, rather, it is a consequence of it.
The Hubble telescope did not discover that there is a red shift in the spectra of Galaxies. The telescope is named after the American astronomer, Edwin Hubble, who discovered the phenomenon in the 1920s.
The Red Shift or Doppler effect
That is called a red shift or a Doppler shift.
The red shift depends on the relative motion of the emitting source and receiving detector. Hydrogen per se has no red shift. There is hydrogen with great red shift (in stars in galaxies far away that are moving rapidly away from us).
Redshift is the phenomenon where light from distant galaxies appears to be shifted towards longer (redder) wavelengths. This is due to the expansion of the universe causing the galaxies to move away from us. The amount of redshift is directly related to the distance of the galaxy from us, with more distant galaxies experiencing higher redshift.
that the universe is expanding(: YouR WelomE
Red shift caused by the galaxies moving apart.
expanding