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  • Other Sources  (7)
  • LUNAR AND PLANETARY EXPLORATION  (6)
  • GEOPHYSICS  (1)
  • perturbation theory
  • 1975-1979  (7)
  • 1975  (7)
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  • Other Sources  (7)
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Keywords
  • LUNAR AND PLANETARY EXPLORATION  (6)
  • GEOPHYSICS  (1)
  • perturbation theory
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  • 1975-1979  (7)
Year
  • 1
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    Absolute plate motions by boundary velocity minimizations (1975)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The main interaction of the earth's interior with the lithosphere is as a material source and sink. An absolute reference frame defined by minimizing the translational motion of tectonic plate boundaries differs by 0.6 cm/year from a frame defined by hot spot traces and by 0.4 cm/year from the frame defined by the most plausible model of drag forces on the plates. The rms absolute translational velocities are about 2 cm/year for ocean-ocean plate boundaries and 1.5 cm/year for ocean-continent plate boundaries. The close agreement between the source and sink and the drag-dependent definitions suggests that the lithosphere, as a stress guide, to some extent controls the locations of its sources and sinks.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 80; Jan. 10
    Format: text
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  • 2
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    The seven ages of a planet (1975)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: On the basis of almost universally held assumptions concerning the formation of the planets and the isolation of the solar system from outside influences it follows rather plausibly that all terrestrial planets pass in principle through seven stages. The processes involved include the solidification of grains from gas in the condensation stage, planetesimal interactions, and formation processes. Vigorous convection processes lead to the gravitational separation of iron and the outgassing of oceans. Other stages are related to plate tectonics and terminal volcanism. The ultimate stage of quiescence is characterized by a thick lithosphere and no volcanism.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 26; Sept
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  • 3
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    The gravity and shape of the moon (1975)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Current knowledge about the gravity and geometry of the moon is discussed which has been obtained by Doppler tracking of lunar orbiters, laser ranging, metric photography, and various instruments landed on the moon. Determinations of spherical harmonic coefficients of the lunar gravitational field are described, significant features observed in the field are noted (including the Orientale complex), and measurements of physical librations are reviewed. Systems for determining the lunar geometry and topography are described along with their intrinsic disadvantages. Tectonic implications of the lunar gravitational field and shape are discussed in regard to thermal evolution, marked variations in elevations, crustal and mascon formation, and volcanism.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: EOS; 56; June 197
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  • 4
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    Early scattering by Jupiter and its collision effects in the terrestrial zone (1975)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: When Jupiter was on the order of three to ten earth masses in size, there undoubtedly was a considerably larger mass of condensed matter in its zone, since Jupiter would have perturbed most of it to other parts of the solar system. Monte Carlo studies indicate a significant portion would have crossed the earth's orbit. If the earth and moon had not yet fully formed, the probability of earth-zone planetesimals being hit by this Jupiter-scattered material was high. Further Monte Carlo models of these collisions and their products indicate a significant portion of matter was heated to melting, even if less than 5% of the relative kinetic energy went into heat. The models include capture probabilities by an embryo earth and a protolunar swarm. Because heat energy is correlated with comminution energy, and because the capture probability of the swarm is mass-dependent while embryo's is not, the protolunar material suffered much higher heating on the average than did the proto-earth material.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 25; May 1975
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  • 5
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    Selenodesy (1975)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Only the second- and third-degree harmonics of the global gravity field are known reliably. The most pronounced features in the near side field are still the mascons, mass excesses in ringed maria. Statistically, the magnitudes of variations in the lunar gravity field for feautres of 150- to 1100-km extent are between one-fourth and one-third those predicted from the earth on the assumption of equal stress implication. Aspects of rotational dynamics and geometry are also discussed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Reviews of Geophysics and Space Physics; 13; July 197
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  • 6
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    A co-accretional model of satellite formation (1975)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: A model of the accumulation process of a satellite about an accreting planet is proposed in order to explain the difference in relative size between the moon and the outer planets' satellites. The parameter that most strongly affects the final mass ratio of the pair in this model is the time at which the secondary embryo is introduced. Thus the difference between terrestrial and outer planet satellite systems is easily understood in terms of the differences in Q (the specific dissipation function of the particles in the circumplanetary cloud) between these planets. The high Q of the outer planets does not allow a satellite embryo to survive a significant portion of the accretion process; therefore only small bodies formed very late in the accumulation of the planet remain as satellites.
    Keywords: LUNAR AND PLANETARY EXPLORATION
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  • 7
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    Dynamics of lunar origin and orbital evolution (1975)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The considerable differences in bulk composition of the moon and the earth have led most investigators to favor the capture hypothesis of lunar origin. However, upon closer examination all forms of the hypothesis still seem much less plausible dynamically than formation by accretion, i.e., acquisition of the moon in many small pieces rather than as predominantly one body. Models of accretion do suggest that the proto-lunar matter had a significantly different history from the proto-earth matter. A better understanding of collisions is needed to infer the compositional consequences of this history. Recent work on the acceleration of the moon's orbit exacerbates the time scale problem of orbital evolution. However, it now is much clearer that the locus of tidal dissipation is in the oceans and hence that the solution to the time scale problem lies in differing oceanic configurations in the past.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Reviews of Geophysics and Space Physics; 13; May 1975
    Format: text
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