since different gases give different color when burning, how can we know that the red colour we obtained is not just the actual color of gases burning, but rather a red shift?
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Red shift and blue shift is the title we have given to what can happen to the expected colour spectrum indication when we look at a far away object.
If we expect X, but get X+Y, we know that either we have issues with measuring, or something else happened.
We have since ruled out the possibility of measuring being flawed and are left with only the possibility that what should be X, is shown as X+Y, and the reason for that is that these objects are moving away or towards us.
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