The evolution of the earth and its inhabitants; a series delivered before the Yale chapter of the Sigma xi during the academic year 1916-1917 . u -o V o u: bx O rt£&. CM C/2 .2S < O _o ^u Z _i Ok AND ITS INHABITANTS 9 relationships to planetary systems. They seem to be relatedin their origin to New Stars and these in turn are thought tobe produced by stars sweeping through clouds of meteoric orgaseous matter and attaining temporarily, from the swiftimpacts, an enormous brilliancy. The impact is so super-ficial, however, that the extreme brilliance is usually lostin a few days or weeks, and
The evolution of the earth and its inhabitants; a series delivered before the Yale chapter of the Sigma xi during the academic year 1916-1917 . u -o V o u: bx O rt£&. CM C/2 .2S < O _o ^u Z _i Ok AND ITS INHABITANTS 9 relationships to planetary systems. They seem to be relatedin their origin to New Stars and these in turn are thought tobe produced by stars sweeping through clouds of meteoric orgaseous matter and attaining temporarily, from the swiftimpacts, an enormous brilliancy. The impact is so super-ficial, however, that the extreme brilliance is usually lostin a few days or weeks, and the star subsides through astage like a planetary nebula into a peculiar type of starknown as the Wolf-Rayet stars. The origin of the true plane-tary nebulae has not, however, been observed, as they appearto possess a longer life than those which have originated inthe past few centuries from new stars. The ring nebulae are few and special, having the form of avortex ring. The stellar nebulae form another small group which lookin the telescope like hazy stars. By far the greatest number of the nebulae are classified asspiral nebulae, more than 120,000 of which
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