Intelligent Life in the Universe"A translation, extension, and revision of [the author's Vselennai︠a︡, zhiznʹ, razum]". Bibliography: p. 489-495. |
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Page 57
... atom . The remaining elements are present in the form of relatively insignificant impurities . TABLE I. COSMIC ABUNDANCE OF THE ELEMENTS The average Relative atomic Relative cosmic Atom weight abundance , atoms Hydrogen 1.0 10,000,000 ...
... atom . The remaining elements are present in the form of relatively insignificant impurities . TABLE I. COSMIC ABUNDANCE OF THE ELEMENTS The average Relative atomic Relative cosmic Atom weight abundance , atoms Hydrogen 1.0 10,000,000 ...
Page 64
... atoms is at least 1013 cm3 . And yet we cannot consider interstellar space a vacuum . A vacuum is defined as a system in which the mean free path of the atoms or molecules ( ▽ that is , the average distance that the particles move ...
... atoms is at least 1013 cm3 . And yet we cannot consider interstellar space a vacuum . A vacuum is defined as a system in which the mean free path of the atoms or molecules ( ▽ that is , the average distance that the particles move ...
Page 184
... atoms , that their urges and supposed free wills arose merely from the interaction of an enormously large number of molecules , in a way which , although too complex to use predictively , was , in principle , deter- mined . But today ...
... atoms , that their urges and supposed free wills arose merely from the interaction of an enormously large number of molecules , in a way which , although too complex to use predictively , was , in principle , deter- mined . But today ...
Contents
Preface by Carl Sagan | 2 |
Extraterrestrial life as a psychological projective test | 12 |
Chapter | 26 |
Copyright | |
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angular momentum appears approximately astronomer atmosphere atoms billion biological bright Chapter chemical clouds clusters color cosmic Courtesy of Mt craters dark areas Deimos density detected disk distance dust Earth electrons emitted energy environment evolution example exosphere extraterrestrial Figure formed frequency Galactic galaxies helium Hertzsprung-Russell diagram hydrogen hypothesis increase infrared intelligent interstellar medium Jupiter large number laser lifetime light lines living systems luminosity magnetic field magnitude main sequence Mars Martian mass material microorganisms molecular Moon motion nebula nucleic acids nucleus observations occur optical orbit origin oxygen Palomar Observatories panspermia parsecs particles period Phobos photograph planet planetary systems polar possible present primitive protons protostar radiation radio emission radius red giant region relatively rotation satellites sec¹ secular acceleration signal solar system Soviet space spacecraft spectral type spectrum stars stellar supernova technical civilization telescope temperature terrestrial transmitted ultraviolet universe velocity Venus wavelengths Wilson and Palomar