We figure out the chemical compositions of stars by looking at their wavelengths, but wouldn’t this be influenced by red shift?

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We figure out the chemical compositions of stars by looking at their wavelengths, but wouldn’t this be influenced by red shift?

In: Chemistry

Yes, absolutely! But the spectra of the elements within stars aren’t just single peaks, they are a series of peaks at very specific wavelengths and spacing. If the star’s spectra is shifted (as they usually are) the characteristic pattern can still be detected and the amount of shift then used to calculate the relative movement of said star.

Adding to that /u/Phage0070 said, the (light in general) is also used to determain its distance/speed/if it has planets/temperature/size.