Titlebook: Cosmochemical Evolution and the Origins of Life; Proceedings of the F J. Oró,S. L. Miller,R. S. Young (Head of Planetary Conference proceed

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fatuity

Fitness in the Universe: Choices and Necessitiessons. One such choice is fundamental: if the proton had not so much greater mass than the electron, all matter would be fluid; and if the proton did not have exactly the same numerical charge as the electron — or some simple multiple of that charge — virtually all matter would be charged. If a unive

Water-Brash

Galactic Clouds of Organic Moleculesthin these clouds that the formation of stars and planetary systems is believed to take place. The collapse of these clouds to form stars takes place in a very small fraction of the astronomical lifetime of a star. It is precisely at this moment that the clouds of organic molecules appear.

CLOT

The Outer Solar System: Perspectives for Exobiology Saturn have retained the mixture of elements originally present in the solar nebula. Subsequent low temperature chemistry has produced the expected array of simple molecules giving characteristic absorption bands in the spectra of these planets. Microwave and infrared observations show that the low

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Aspects of the Geologic History of Seawaterd deal about the limits to the chemistry of the oceans during the last 600 m.y., and about the mechanisms that have kept the composition of ocean water within its rather narrow bounds. We also know something, but a good deal less, about ocean water chemistry during the preceding 2500 m.y.; but there

DAUNT

Homeostatic Tendencies of the Earth’s Atmosphererature history predicted from solar luminosity. From the fossil record it can be deduced that stable optimal conditions for the biosphere have prevailed for thousands of millions of years. We believe that these properties of the terrestrial atmosphere are best interpreted as evidence of homeostasis

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厌恶

The Development and Diversification of Precambrian Lifeth history. This progress has accrued chiefly from micropaleontological and organic geochemical studies of fine-grained, ancient cherts. Although understanding of the early biota — of its composition, diversity, paleoecology and evolution — still remains far from adequate, three particularly signifi