what is red shift and how do we know about it?
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Certain atoms/compounds make very distinct spectral lines, some like hydrogen and helium are present in any star, when those lines are shifted taped the red part of the visual spectrum we can deduce that that star must be moving away form is very fast, this is because the wavelength of light will get stretched out if something is moving away really fast, it is analogous to the Doppler shift you hear when a truck/motorcycle passes you.
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