We can't be sure. The only thing we know for sure is that it could be explained as
the speed with which that galaxy is receding from us. If that's actually the cause
of the red shift, then from all the red shifts that we observe, we have to conclude
that all of the distant galaxies are receding from us, and the farther away one is
already, the faster it's receding. If all of that is true, then the whole universe is
expanding. This is the research that made Hubble famous.
Well said, but there is another reason. Maybe the light is coming from a large star (gravity hole, red shift due to gravity).
red shift is a distance and galaxies are planets. galaxies are also chocolate bars and red shift is not. thanks for your time. now go use your own knowledge and stop using google you gimps.
It means they are moving away from us.
It tells us that most galaxies are moving away from us.
Generally, the galaxies that are further away will have the larger red shifts.
expanding
The red end of the spectrum.
red shift is a distance and galaxies are planets. galaxies are also chocolate bars and red shift is not. thanks for your time. now go use your own knowledge and stop using google you gimps.
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.
It means they are moving away from us.
It tells us that most galaxies are moving away from 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
expanding
That is called a red shift or a Doppler shift.
the universe is changing by red shift because when red shift occurs it means that galaxies and stars are moving away from us. this means that the whole universe must be expanding.