Maarten Schmidt identified the large redshift of the quasar 3C 273 in his 1963 report. Recognizing familiar spectral lines at a common shifted wavelength scale made the seemingly star-like source a cosmological object, changing the interpretation of its luminosity.[ref]
3C 273: A Star-Like Object with Large Red-Shift by Maarten Schmidt. author list and the described study’s abstract or introductory account
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