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cially in the snow-white parts of the moon.
But there are great smooth dark spaces, like
the clear black ice on a pond, more free from
craters, to which the equally inappropriate
name of seas has been given. The most con-
spicuous crater, Tycho , is near the south
pole. At full moon there are seen to radi-
ate from Tycho numerous streaks of light,
or ”rays,” cutting through all the mountain
496