3C 273 : A Star-Like Object with Large Red-Shift

@article{Schmidt19633C2,
  title={3C 273 : A Star-Like Object with Large Red-Shift},
  author={M. R. Schmidt},
  journal={Nature},
  year={1963},
  volume={197},
  pages={1040-1040}
}
In the early 1960s, astronomers were puzzled by quasars — sources of intense radio emission that seemed to be stars, but had unintelligible optical spectra. In 1963, Maarten Schmidt solved the puzzle by recognizing the Balmer lines of hydrogen, strongly redshifted, in the spectrum of the quasar 3C 273. Schmidt reached the "most direct and least objectionable" conclusion, that 3C 273 was no star, but the enormously bright nucleus of a distant galaxy. 
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