. The Adolfo Stahl lectures in astronomy, delivered in San Francisco, California, in 1916-17 and 1917-18, under the auspices of the Astronomical Society of the Pacific. ect and neither type ofterrestrial crater has any features similar to the huge centralpeaks which so frequently rise from the floors of the largerlunar ones. These peaks are in no sense secondary crater-cones ; they are to all appearance true mountain peaks. But if there are difficulties in the way of fully explainingthe hmar markings by the action of internal forces, the objec-tions to the meteoric theory are of even greater w
. The Adolfo Stahl lectures in astronomy, delivered in San Francisco, California, in 1916-17 and 1917-18, under the auspices of the Astronomical Society of the Pacific. ect and neither type ofterrestrial crater has any features similar to the huge centralpeaks which so frequently rise from the floors of the largerlunar ones. These peaks are in no sense secondary crater-cones ; they are to all appearance true mountain peaks. But if there are difficulties in the way of fully explainingthe hmar markings by the action of internal forces, the objec-tions to the meteoric theory are of even greater weight. Thebombardment must obviously have been a terrific one bymeteors of tremendous size, and since the Earth and Moonrevolve about the Sun together in the same general path,craters of meteoric origin should be correspondingly large The Moon 91 and numerous upon the Earth. As a matter of fact, however,the largest meteoric mass found upon the Earth could haveproduced but a puny crater compared with those upon theMoon; and the only crater upon the Earth, so far as known,that was probably formed by a falling meteorite is the cele-brated meteor-crater in Arizona.^.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectastronomy, bookyear19
