Astronomy, a handy manual for students and others (1918)
Dyson, Frank Watson, Sir, 1868-1939 · New York, E.P. Dutton & Co. · leaf 152
ars is one of great interest as wellas one of considerable difficulty. The spectrum ofMars apparently shows no lines which are not in thesolar spectrum. The question which has to be decidedis, Are certain lines which we know to be producedby absorption in the Earths atmosphere more intensethan can… … 142 ASTRONOMY that of Mars. Sir W. Huggins and Dr. Vogel con-sidered that the evidence pointed to the existence ofwater-vapour in the atmosphere of Mars, but Prof.Keeler at Allegheny, and Prof. Campbell at the LickObservatory, found no appreciable difference betweenthe spectra of Mars and the Moon,…
Astronomy
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