By Cyclops Design Team Staff, Stanford University, États-Unis. National aeronautics and space administration, Ames research center (Moffet Field, Calif).
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Additional resources for Project Cyclops: A Design Study of a System for Detecting Extraterrestrial Intelligence
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Oliver and Boyd, London (1961). 15. , J. Amer. Chem. , 77, 2351-61 (1955). 16. , Current status of chemical studies on the origin of life. Space Life Sciences, 1, 64-96 (1968). 28 ! 7. , Cavitations during impact of liquid water on water: geochemical implications. Science, 161, 1343-44 (1968). 18. , Prebiotic porphyrin genesis-porphyrins from electric discharge in methane, ammonia and water vapor. Proc. Nat. Acad. Sci. , 59, 22-28 (1968). 19. , Microorganisms three billion years old from the early preCambrian of South Africa.
So long as we restrict ourselves to the same pattern of seas, continents, and basins, it is reasonable to suppose that tidal drag varies as the square of the tidal amplitude-that is, as k 2 . However, differing continental configurations and coastal features can radically affect the total drag. There is evidence that the tidal friction on the Earth has varied widely during its history. If Gerstenkorn's theory (refs. 12, 13) of the evolution of the Moon is correct, the Earth underwent a period of enormous tides on the order of 10 9 years ago and was slowed greatly by the Moon at that time.
For n = 2 we see that at half the present age of the disk, or 5 billion years ago, over 90 percent of all stars now in existence had already been born. In the 1959 paper, Schmidt found that the observational evidence favored n = 2 for all stellar types. In his 1963 paper, however, he argues that the past average birth rate of solar mass stars could not have exceeded three times the present approach rate. the less than This means f'mal point one-third that the in Figure as indicated true curve 2-9 with by the should a slope dashed Thus, the fraction g(t) of sites with life will be: not line.