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A Source Book in Astronomy and Astrophysics 1900-1975
"A new era of planetary spectroscopy began when V. M. Slipher photographed the spectra of the major planets. Early in the twentieth century Slipher extended the spectra to the red and infrared wavelengths and showed that the major planets exhibit strong absorption lines at a variety of wavelengths. As shown in the illustrations appended to the paper given here, the observed bands grow in number, breadth, and intensity as one goes from Jupiter through Saturn and Uranus and on to Neptune."