![]() ![]() It’s been shifted even further to the right for the Galaxy B spectrum. And it’s been shifted to about here for the Galaxy A spectrum. This one, for example, starts out roughly about here. However, we can clearly see that this pair of spectral lines has been shifted towards the red end in both Galaxy A spectrum and Galaxy B spectrum.Īnd this is true for the other spectral lines as well. And we can see that same spectral lines signature in both of these spectra here - in Galaxy A and B. Let’s start with this pair of spectral lines. So what we need to do in this question is to see how the spectral lines from Galaxy A and B compared to those from the laboratory source. ![]() Same thing with blueshift, if something is moving towards us, then the spectral lines will move towards the blue end of the spectrum. All it means is that if something is moving away from us, then its spectral lines will move towards the red end of the spectrum. What do those things mean though? What does it mean for something to be redshifted or blueshifted? ![]() Conversely, any source moving towards us will have its spectral lines blueshifted. We also know that any source moving away from us will have its spectral lines redshifted. In other words, its stationary relative to Earth. This is because these are the spectral lines that we would expect from a source that’s not moving at all relative to Earth. Therefore, the spectral lines that we find from the laboratory source are in a way our reference spectral lights. Now, since the laboratory source is on Earth, that means that it cannot be moving relative to Earth because it’s on Earth. So that obviously has to be back here on Earth. As well as this, we’ve got the same spectral lines from a laboratory source. So we can see that we’ve got spectral lines from two galaxies in the diagram: the labelled Galaxy A and Galaxy B. How is Galaxy A moving relative to Earth? How is Galaxy B moving relative to Earth? Which galaxy is moving faster relative to Earth? The diagram shows the spectral lines in the light from two galaxies as well as the same spectral lines in the light from a laboratory source. ![]()
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