Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 325
Mars. Barnard has sug-gested that there may bean elevated region in tjieplace on which the spot isobserved where the snowor frost remains until afterit has entirely disappearedin the valleys. At any rate,this phenomenon stronglypoints to the conclusionthat there are considerableirregularities in… … Fig. 105. — Disappearance of polar capof Mars (Barnard). CH. IX, 172] THE PLANETS 279 The polar cap around the south pole of Mars has beenmore thoroughly studied than the one at the north polebecause the south pole is tijrned toward the earth when Marsis in opposition near the perihelion point of…
Astronomy
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