Advances in space science and technology. Volume 4 by Frederick I. Ordway

By Frederick I. Ordway

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It may therefore be expected that the prevalence of life in our universe would be directly proportional to the number of existing planetary systems; whether there are few or many depends on how they are created. Theories of planet formation may be classed as collision formation theories and natural formation theories. Theories of the former class generally imply that planet formation is an extremely rare occurrence and therefore the development of biological life must be a rare phenomenon. EXTRATERRESTRIAL INTELLIGENCE 41 However, the natural formation theories imply the existence of large numbers of planetary systems and, therefore, frequently occurring environments suitable for chemical and biological evolution.

Acad. sei. Paris, 253, 1832-1833. 42. Mass, J. (1962). Total ionospheric electron contents from the Doppler integral of satellite signals. J. Atmospheric and Terrest. Phys. (to be published). 43. Mass J. (1962). Contribution â l'étude de l'ionosphère â l'aide des satellites artificiels. Thèse, Paris (to be published). On the Possibilities of the Existence of Extraterrestrial Intelligence ROGER A. MACGOWAN Army Ordnance Missile Support Agency, Redstone Arsenal, Alabama I. Introduction II. The Origin of Planetary Systems A.

And Weiffenbach, G. C. (1960). A satellite Doppler navigation system. Proc. E. 48 (4), 507-516. 36. Kershner, R. B. (1960). The Transit system. " Inst. , New York. 37. Hibberd, F. , and Thomas, J. A. (1959). Satellite Doppler measurements and the ionosphere. J. Atmospheric and Terrest. Phys. 13, 376-379. 38. Ross, W. J. (1960). The determination of ionospheric electron content from satellite Doppler measurements. / . Geophys. Research 65 (9) 2601-2615. 39. Singer, S. F. (1956). " Phys. Rev. 104, 11-14.

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