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A VOYAGE IN SPACE
edge than on the other. It may be that they really are more numerous; but, if so, there must be a dividing wall pointed straight at the Earth, separating the region of many stars from that of few. It is much easier to believe that there is some obscuring stuff between us and the side which shows fewer
Fig. 84.—Nebula in Cygnus.
stars; so that the light of many of the faint stars is blotted out. If we count the number of stars within a given area on one side of the edge, and also the number in an equal area on the other side, we shall get a notion how many are lost by the stoppage of light.
This suggests that it may be of interest to count
