The call of the stars; a popular introduction to a knowledge of the starry skies with their romance and legend . alf a mile to more than two miles in extend in approximately straight lines, frequentlytraversing walled plains and craters, without any appar-ent interruption. Among the most conspicuous of thesestrange chasms are the Serpentine Valley of Herodotus,the well-known Ariad^us and Hyginus clefts, and thedeep sharp cleft crossing the floor of Petavius. Theyare believed to be simply open cracks in the lunarsurface, caused by the surface splitting as it cooleddown and became too
The call of the stars; a popular introduction to a knowledge of the starry skies with their romance and legend . alf a mile to more than two miles in extend in approximately straight lines, frequentlytraversing walled plains and craters, without any appar-ent interruption. Among the most conspicuous of thesestrange chasms are the Serpentine Valley of Herodotus,the well-known Ariad^us and Hyginus clefts, and thedeep sharp cleft crossing the floor of Petavius. Theyare believed to be simply open cracks in the lunarsurface, caused by the surface splitting as it cooleddown and became too small for its interior. The rays are long light-coloured streaks, which radi-ate from several of the principal craters in all directions,and are not well seen except at or near full moon. Theyextend in some cases to a distance of some hundreds ofmiles, passing across valley and mountain, and at fullmoon, rendering some of even the larger craters, suchas the great crater-plains Clavius and Maginus, almostunidentifiable. They appear to be neither elevatednor depressed with reference to the general lunar sur-. Paris Observatory Plate XXX. The Lunar Apennines, Alps, and Caucasus (Image inverted as in astronomical telescopes) The Moon 351 face, and are ordinarily from five to ten miles in ray system connected with Tycho is by far themost noteworthy, although those in connection withCopernicus and Kepler are very striking. As to theirorigin and nature little is known. By some it is sup-posed that they were originally great cracks caused byinternal pressure, which have been filled, either withlighter coloured material forced up from below, or witha whitish powder emitted by the craters from which therays issue. From earliest times, in all qiiarters of the world, thecold chaste Moon has been an easy and favourite sub-ject for myth making. There have been seen in it byevery age and race, a Man in the Moon, a Womanin the Moon, a Hare in the Moon, and so on, whilevarious and in
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectcon, booksubjectstars
