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I want to see absorption lines now what exactly are absorption lines say you have a given spectrum of light thatamp;#39;s being emitted from some sort of hot object like a star and you have different substances like sodium magnesium or calcium floating around in that white when certain colors of light certain wavelengths strike each of those substances what will happen is due to the quantum nature of the electrons around those substances the light will be absorbed temporarily and re scattered creating a slightly darker spot if youamp;#39;re looking at a pinpoint of light now these dark spots are used in almost every astronomical observation we make it is extremely difficult to find any astronomy that doesnamp;#39;t involve absorption spectra in some capacity whether it is just looking for the particular emission lines to tell what kind of molecules and atoms are in that object say for exoplanets or whether youamp;#39;re measuring the Doppler shift of the light stretching and squash