< Page:EB1911 - Volume 21.djvu
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PLANET
PLANETARY SPECTRA, PHOTOGRAPHED AT LOWELL OBSERVATORY, FLAGSTAFF, ARIZONA, Moow BY V. M. SLIPHER F b E D C B a A TLPITER Sxrtm LRANUS. NI;PrUE Companson spectrogram's of the Moon and Mars, showing absorptxon bands m that of the latter whxch denote the presence XXI 716
of water vapour m the Maman atmosphere (see MARS).
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