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  • 1
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    The formation of terrains antipodal to major impacts (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The SALE, or Simplified Arbitrary Lagrangian Eulerian code is presently used to calculate the antipodal pressures generated by large impacts on icy satellites and planets of various compositions and core sizes. While in a high density core/lower density mantle planet there is a refraction of the incident pressure wave away from the antipode by the core, resulting in a low antipodal pressure, a planet with a low velocity core with a higher-wave speed mantle will focus the waveform to maximize antipodal pressure. Specific impact basins on the moon, Mercury, and several icy satellites are modeled to ascertain whether the impacts were capable of producing the observed antipodal features.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus (ISSN 0019-1035); 93; 159-168
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Examination of returned solar-max surfaces for impacting orbital debris and meteoroids (1985)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Previous theoretical studies predicted that in certain regions of earth orbit, the man-made earth orbiting debris environment will soon exceed the interplanetary meteoroid environment for sizes smaller than 1 cm. The surfaces returned from the repaired Solar Max Mission (SMM) by STS 41-C on April 12, 1984, offered an excellent opportunity to examine both the debris and meteoroid environments. To date, approximately 0.7 sq. met. of the thermal insulation and 0.05 sq. met of the aluminum louvers have been mapped by optical microscope for crater diameters larger than 40 microns. Craters larger in diameter than about 100 microns found on the initial 75 micron thick Kapton first sheet on the MEB (Main Electronics Box) blanket are actually holes and constitute perforations through that blanket. The following populations have been found to date in impact sites on these blankets: (1) meteoritic material; (2) thermal paint particles; (3) aluminum droplets; and (4) waste particles.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Inst. 16th Lunar and Planetary Sci. Conf.; p 42-43
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Guide to using lunar soil and simulants for experimentation (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: It is pointed out that lunar soil can be described as well-graded silty sands or sandy silts with an average particle size by weight in the range from 0.040 to 0.130 mm. The density of in situ bulk lunar soil is typically 1.4 to 1.9 g/cu cm. Changes in soil from moon to laboratory are considered along with some critical differences between simulants and lunar soil. Attention is given to agglutinates, iron metal distributed throughout the agglutinatic glass, solar wind hydrogen, and major lunar minerals (anorthite, pyroxene, ilmenite, olivine). The use of lunar fines as experimental samples is discussed, and the characteristics of simulants for experiments are examined, taking into account grain size distribution, particle type distribution, a highlands simulant, and a high titanium mare simulant. Simulants for testing equipment and structures are also described.
    Keywords: LUNAR AND PLANETARY EXPLORATION
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  • 4
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    Carbynes - Carriers of primordial noble gases in meteorites (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Five carbynes (triply bonded allotropes of carbon) have been found by electron diffraction in the Allende and Murchison carbonaceous chondrites: carbon VI, VIII, X, XI, and (tentatively) XII. From the isotopic composition of the associated noble-gas components, it appears that the carbynes in Allende (C3V chondrite) are local condensates from the solar nebula, whereas at least two carbynes in Murchison (C2 chondrite) are of exotic, presolar origin. They may be dust grains that condensed in stellar envelopes and trapped isotropically anomalous matter from stellar nucleosynthesis.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science; 209; Sept. 26
    Format: text
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  • 5
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    Surface electrical properties experiment, part 2 (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: For abstract, see N75-15570.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-141472
    Format: application/pdf
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  • 6
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    Surface electrical properties experiment, part 1 (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The work is reported which was performed on the Surface Electrical Properties Experiment Data Acquisition System. Areas discussed include: data handling and processing, installation and external signal application, operation of the equipment, and digital output. Detailed circuit descriptions are included.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-141471
    Format: application/pdf
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