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  • 1
    Monograph available for loan
    Monograph available for loan
    Washington, DC : National Aeronautics and Space Administration
    Call number: G 8956 ; G 8956(2. Ex., Fanselau)
    Type of Medium: Monograph available for loan
    Pages: XII, 599 S. : graph. Darst.
    Series Statement: NASA SP 345
    Location: Upper compact magazine
    Location: Upper compact magazine
    Branch Library: GFZ Library
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 36 (1964), S. 850-854 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Macmillian Magazines Ltd.
    Nature 418 (2002), S. 627-630 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The isotopic composition of graphite is commonly used as a biomarker in the oldest (〉3.5 Gyr ago) highly metamorphosed terrestrial rocks. Earlier studies on isotopic characteristics of graphite occurring in rocks of the approximately 3.8-Gyr-old Isua supracrustal belt (ISB) in ...
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Macmillian Magazines Ltd.
    Nature 420 (2002), S. 202-202 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Nature 418, 627–630 (2002). On page 628, line 23, of this Letter, the isotope equilibrium fractionation temperature of 500 °C was incorrectly stated as ...
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Astrophysics and space science 29 (1974), S. 63-159 
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this fourth and last part of our analysis, the first section (14) contains a study of the chemical composition of the planets and satellites. A sharp distinction is made between the large quantity of speculations about the interiors of the bodies and the rather meagerfacts known with a reasonable degree of certainty. It is shown, however, that the latter are sufficient todisprove the old concept of a Laplacian disc of homogeneous chemical composition. There is asystematic variations in the chemical composition of planets (and probably also of satellites) so that heavy elements are more abundant in the outermost and in the innermost regions of the systems. Section 15 containsa study of meteorites. These have earlier been interpreted in terms of ‘exploded planets’ and condensation processes in thermodynamic equilibrium. It is shown that such models are irreconcilable with the laws of physics and also with the meteoritic observations. These instead are found toprovide abundant information on the processes in jet streams and on early fractionation and condensation. Further work along these lines supplemented with other solar system materials studies may lead to a detailed reconstruction of important events in the evolution of the solar system. Section 16 demonstrates that the location of the different groups of secondary bodies is a result of a plasma phenomenon occurring at the critical velocity limit. These have recently been studied in detail in the laboratory but have not yet been fully applied to astrophysics.Groups of bodies in the planetary and the satellite systems related by the critical velocity shouldhave the same gravitational potential. There are large chemical differences between groups of different gravitational potential. This is reconcilable with the chemical differentiation found in Section 14. Finally, Section 17 deals with thestructure of the different groups of bodies and shows that the mass distributionis a function of the spin of the central body. Summarizing the properties and distribution of bodies in the solar system against this background, it is shown that there isno need for ‘missing planets’ or to explode hypothetical large bodies. Nor is there any justification for involvingdrastic ad hoc changes in the orbits of existing bodies. The scheme is complete in the sense that in all places where groups of bodies are expected, such bodies are actually found. All of the existing bodies are accounted for (with the exception of the small Martian satellites!). The general conclusion is that already with the empirical material now availableit is possible to suggest a series of basic processes leading to the present structure of planet and satellite systems in an internally consistent way. With the expected flow of data from space research the evolution of the solar system may eventually be described with about the same confidence and accuracy as the geological evolution of the Earth.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Astrophysics and space science 55 (1978), S. 2-5 
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Astrophysics and space science 9 (1970), S. 3-33 
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract (7)Formation of celestial bodies. The basic concepts of the accretional process are discussed, and the inadequacy of the contractional model is pointed out. A comparison is made between the general pre-planetary state on the one hand and the present state in the asteroidal region on the other. A model for accretion of resonance-captured grains leading to the formation of resonance-captured planets and satellites is suggested. (8)Spin and accretion. The relation between the accretional process and the spin of planets is analyzed. (9)Accretion of planets and satellites. It is shown that jet streams are a necessary intermediate stage in the formation of celestial bodies. The time sequence of planet formation is analyzed, and it is shown that the newly accreted bodies have a characteristic internal heat structure; the cases of the Earth and the Moon are considered in detail. A region of high initial temperature is found at 0.4 of the present Earth radius, whereas the culminating temperature of the Moon is near its present surface. An accretional heat wave is found to proceed outwards, and may produce the observed differentiation features.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 59 (1972), S. 183-187 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Earth, moon and planets 5 (1972), S. 210-230 
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The origin and evolution of the Earth-Moon system is studied by comparing it to the satellite systems of other planets. The normal structure of a system of secondary bodies orbiting around a central body depends essentially on the mass of the central body. The Earth with a mass intermediate between Uranus and Mars should have a ‘normal’ satellite system that consists of about half a dozen satellites each with a mass of a fraction of a percent of the lunar mass. Hence, the Moon is not likely to have been generated in the environment of the Earth by a normal accretion process as is claimed by some authors. Capture of satellites is quite a common process as shown by the fact that there are six satellites in the solar system which, because they are retrograde, must have been captured. There is little doubt that the Moon is also a captured satellite, but its capture orbit and tidal evolution are still incompletely understood. The Earth and the Moon are likely to have been formed from planetesimals accreting in particle swarms in Kepler orbits (jet streams). This process leads to the formation of a cool lunar interior with an outer layer accreted at increasingly higher temperatures. The primeval Earth should similarly have formed with a cool inner core surrounded in this case by a very strongly heated outer core and with a mantle accreted slowly and with a low average temperature but with intense transient heating at each individual impact site.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Origins of life and evolution of the biospheres 26 (1996), S. 240-241 
    ISSN: 1573-0875
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Type of Medium: Electronic Resource
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