Side-Lights On Astronomy And Kindred Fields of Popular Science

Cover Side-Lights On Astronomy And Kindred Fields of Popular Science
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The spectroscope shows that, so far as the chemical elements go, otherworlds are composed of the same elements as ours. Hydrogen especiallyexists everywhere, and we have reason to believe that the same is trueof oxygen and nitrogen. Calcium, the base of lime, is almost universal. So far as chemical elements go, we may therefore take it for grantedthat the conditions under which life begins are very widely diffused inthe universe. It is, therefore, contrary to all the analogies of natureto suppo
...se that life began only on a single world.
It is a scientific inference, based on facts so numerous as not toadmit of serious question, that during the history of our globe therehas been a continually improving development of life. As ages upon agespass, new forms are generated, higher in the scale than those whichpreceded them, until at length reason appears and asserts its sway. Ina recent well-known work Alfred Russel Wallace has argued that thisdevelopment of life required the presence of such a rare combination ofconditions that there is no reason to suppose that it prevailedanywhere except on our earth.


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