Cosmic evolution : being speculations on the origins of our environment / by E.A. Ridsdale.

  • Ridsdale, E. A.
Date:
1889
Catalogue details

Licence: Public Domain Mark

Credit: Cosmic evolution : being speculations on the origins of our environment / by E.A. Ridsdale. Source: Wellcome Collection.

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    large plauet, there are, in all, nine planets, viz. (taking them in order of greatest dis- tance from the sun) Neptune, Uranus, Saturn, Jupiter,Hhe Asteroids, Mars, Earth, Venus, and Mercury. Now if the Sun's mass originally occupied all tho space to the orbit of Neptune, and left the planets suc- cessively behind it at each great chemical collapse occasioned by the formation of a fresh inert bof^y, it is obvious that v^^hen Neptune had been left behind, one inert body had been formed ; when Uranus, two; when Saturn, three ; and so on. When the collapse that led to the formatior^ of the Earth took place, seven bodies had been so formed. Now after each planet was thrown off, the chemical evolution in that planet must have proceeded much faster than in the remaining solar mass, on account of the smaller size, and consequently quicker loss of heat of the planet. Also, being separated
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