Collins, A. Frederick (Archie Frederick), 1869- · New York, London, D. Appleton and company · leaf 70
Fig. 52.—Three Views op Mercury. Seeing Mars.—We hear more of Mars than of any otherplanet for two reasons: first, because great lines can be seen onhis surface which are thought to be canals, and second, sinceMars sometimes comes almost as closeto the earth as Venus, there has beena great deal of…
Astronomy · Stars
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